"US population = 330M , 80M across 4 generations
population that is physically able to travel, can afford travel, travels for business ranges between 20-60 year olds = 160M
calculating maximum demand:
long weekends in summer are peak travel times, lets assume 60% of population who are able and can afford travel, do so during long weekend = 0.6x160M
lets say 60% of this population choses prefers domestic travel while 40% go international (consider Mexico, Canada, London are international"
Ananya M. - "US population = 330M , 80M across 4 generations
population that is physically able to travel, can afford travel, travels for business ranges between 20-60 year olds = 160M
calculating maximum demand:
long weekends in summer are peak travel times, lets assume 60% of population who are able and can afford travel, do so during long weekend = 0.6x160M
lets say 60% of this population choses prefers domestic travel while 40% go international (consider Mexico, Canada, London are international"See full answer
"Clarification Questions
I am assuming we need to deliver the packages to the doorstep.
I am assuming we need to deliver all the packages which are ordered in a single day.
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High level formula
Number of Drones required = (US Population 330M)(Excluding 30% those below 10 years and above 65 years)(internet penetration 90%)([ (10% high networth people)(30 orders per year) ] + ["
Anonymous Muskox - "Clarification Questions
I am assuming we need to deliver the packages to the doorstep.
I am assuming we need to deliver all the packages which are ordered in a single day.
For more product interview experience, please visit TechnoManagers
https://technomanagers101.blogspot.com/
High level formula
Number of Drones required = (US Population 330M)(Excluding 30% those below 10 years and above 65 years)(internet penetration 90%)([ (10% high networth people)(30 orders per year) ] + ["See full answer
"Clarify question and state assumptions:
Streetview from my understanding is compiled by a streetview car going out and taking multiple photos and then Google stitches this together to give us streetview.
I'm only going to look at the streetview outdoor experience, I know for e.g Google also has full views of some businesses, malls, museums etc so for the purposes of this I'm not going to calculate this.
For the purposes of this is it OK if we say how much storage required to store streetview"
Varun - "Clarify question and state assumptions:
Streetview from my understanding is compiled by a streetview car going out and taking multiple photos and then Google stitches this together to give us streetview.
I'm only going to look at the streetview outdoor experience, I know for e.g Google also has full views of some businesses, malls, museums etc so for the purposes of this I'm not going to calculate this.
For the purposes of this is it OK if we say how much storage required to store streetview"See full answer
"Lets see, what kind of cost does google have to incur to run google photos. To think about this clearly, I want to think as if I was going to setup Google Photos now and it doesn't exist till today.
Cost for Building software and maintaining it
Cost for acquiring users
Cost for keeping the data of users safe and accessible
Miscellaneous
Now lets come back to today where Google photos clearly exist and I will think about the costing in each of these sections.
Google photos s"
Anubhav A. - "Lets see, what kind of cost does google have to incur to run google photos. To think about this clearly, I want to think as if I was going to setup Google Photos now and it doesn't exist till today.
Cost for Building software and maintaining it
Cost for acquiring users
Cost for keeping the data of users safe and accessible
Miscellaneous
Now lets come back to today where Google photos clearly exist and I will think about the costing in each of these sections.
Google photos s"See full answer
"Clarifying Questions:
US or globally? globally
Consumer or business use? consumer
Assumptions:
Assuming we are interested in frequent users, let's say someone who uses Google Drive at least 5 times a year. Discluding anyone who has used Google Drive less than 4 times per year.
Assuming Google Drive is a place to store, share, and collaborate on files and folders from your mobile device, tablet, or computer.
Recap:
We would like to estimate the number of users of Google Drive"
Cameron P. - "Clarifying Questions:
US or globally? globally
Consumer or business use? consumer
Assumptions:
Assuming we are interested in frequent users, let's say someone who uses Google Drive at least 5 times a year. Discluding anyone who has used Google Drive less than 4 times per year.
Assuming Google Drive is a place to store, share, and collaborate on files and folders from your mobile device, tablet, or computer.
Recap:
We would like to estimate the number of users of Google Drive"See full answer
Estimation
🧠 Want an expert answer to a question? Saving questions lets us know what content to make next.
"Clarification Questions:
Through in-person purchases or including online? Both
Cinema just for movies? Yes
Amount of revenue or just tickets sold? Tickets sold
High Level Equation:
Cinema tickets in a year = (# of cinemas in the US) * (# of movie playings per cinema per year) * (# of viewers per cinema per screening)
\# of Cinemas in the US = amount of states * average number of cinemas per state
High Density Areas - 30% - 50 cinemas = 50 x 50 x .3 = 750
Suburban T"
Andrea L. - "Clarification Questions:
Through in-person purchases or including online? Both
Cinema just for movies? Yes
Amount of revenue or just tickets sold? Tickets sold
High Level Equation:
Cinema tickets in a year = (# of cinemas in the US) * (# of movie playings per cinema per year) * (# of viewers per cinema per screening)
\# of Cinemas in the US = amount of states * average number of cinemas per state
High Density Areas - 30% - 50 cinemas = 50 x 50 x .3 = 750
Suburban T"See full answer
"Some clarifying questions.
Does this include storage required for backup? Assume - Yes and only one replica.
Will email be compressed? Assume - Yes
Assuming world wide user base.
Let's formulate the equation required to estimate this answer.
total storage required = (Total users x storage growth/per user + new users x storage required/user - all users x delete storage)*compression ratio + storage required for one replica.
Total Gmail users = ~1B
Based on my own ema"
Harsh S. - "Some clarifying questions.
Does this include storage required for backup? Assume - Yes and only one replica.
Will email be compressed? Assume - Yes
Assuming world wide user base.
Let's formulate the equation required to estimate this answer.
total storage required = (Total users x storage growth/per user + new users x storage required/user - all users x delete storage)*compression ratio + storage required for one replica.
Total Gmail users = ~1B
Based on my own ema"See full answer
"Let’s pick SFO (because it's a stupid choice.. probably easier if you pick a smaller airport)
We know each passenger has to go through the scan at least once
We can assume 10% of passengers go through twice
People only go through scans when they depart but not when they arrive
International planes are bigger so carry more people so need to calculate separately
Approach
Estimate how many gates there are
Estimate airport operation hours
Estimate the numbe"
Jax H. - "Let’s pick SFO (because it's a stupid choice.. probably easier if you pick a smaller airport)
We know each passenger has to go through the scan at least once
We can assume 10% of passengers go through twice
People only go through scans when they depart but not when they arrive
International planes are bigger so carry more people so need to calculate separately
Approach
Estimate how many gates there are
Estimate airport operation hours
Estimate the numbe"See full answer
"Assumption US, not global. Two categories of masks: washable/reusable (cloth based) and disposable (surgical and N95)
US population is about 300 million
100M households
3 per households**
Cloth: on average 2 masks needed per person so they can wash it (2*3=6 masks per HH)
100M*6 = 600M cloth masks
Disposable: of the 300M, assuming about 60% is essential workers. So about 300M*.6=180M are essential workers. Of the 180M, I would say abo"
Anonymous Moose - "Assumption US, not global. Two categories of masks: washable/reusable (cloth based) and disposable (surgical and N95)
US population is about 300 million
100M households
3 per households**
Cloth: on average 2 masks needed per person so they can wash it (2*3=6 masks per HH)
100M*6 = 600M cloth masks
Disposable: of the 300M, assuming about 60% is essential workers. So about 300M*.6=180M are essential workers. Of the 180M, I would say abo"See full answer
"Break down into:
OPEX
#Employees x $avg. cost per employee
$Overhead (mktg, legal, compliance)
Content cost (creator payments) 80% of advert. revenue
Elec, cooling, maintenance
CAPEX
#Data centers
Avg servers per data center
Avg. cost $ per server"
James M. - "Break down into:
OPEX
#Employees x $avg. cost per employee
$Overhead (mktg, legal, compliance)
Content cost (creator payments) 80% of advert. revenue
Elec, cooling, maintenance
CAPEX
#Data centers
Avg servers per data center
Avg. cost $ per server"See full answer
"Clarifying questions:
Does the home have to be fully paid off to consider the millenial a homeowner? No, they just need to have the title or put a loan on it
We are only considering the continental US? Yes, not territories
Just four wall stationary homes, not empty land, nor RV/trailer homes? Exactly
Basic Facts:
70 million millennials
300 million US population
Millennials have low rates of homeownership
130 million houses in the US
Millennials span == 18 to 36
Breakdown:
"
Anonymous Parakeet - "Clarifying questions:
Does the home have to be fully paid off to consider the millenial a homeowner? No, they just need to have the title or put a loan on it
We are only considering the continental US? Yes, not territories
Just four wall stationary homes, not empty land, nor RV/trailer homes? Exactly
Basic Facts:
70 million millennials
300 million US population
Millennials have low rates of homeownership
130 million houses in the US
Millennials span == 18 to 36
Breakdown:
"See full answer
"Narrow down on a person (born in city childhood - school - college - work - retirement)
Age:
0-5 = ignoring travel for this part (might travel with parents)
5-19 = weekdays school, weekends outings
School distance 5 km , total = 10km (to & fro) (4 intersections * 1min(time spent) = 4 min/ day)
52 x 5 x 4 = 1040 mins ~ 15 hrs
15 * 14 yrs = 210 hrs
Weekends 52 x 2 = 104 days * 0.3 = 30 days
Trips = 10 km (8 intersections * 1min(time spent) = 8 mins)
30 x 8 ="
Rev - "Narrow down on a person (born in city childhood - school - college - work - retirement)
Age:
0-5 = ignoring travel for this part (might travel with parents)
5-19 = weekdays school, weekends outings
School distance 5 km , total = 10km (to & fro) (4 intersections * 1min(time spent) = 4 min/ day)
52 x 5 x 4 = 1040 mins ~ 15 hrs
15 * 14 yrs = 210 hrs
Weekends 52 x 2 = 104 days * 0.3 = 30 days
Trips = 10 km (8 intersections * 1min(time spent) = 8 mins)
30 x 8 ="See full answer
"Assumptions
Contact lens camera is launched only in the US
Ages most likely to benefit 20-60
Doesn't work with prescription i.e. people who have prescription glasses/contact lens are not the target market
Can't be worn all the time max of 10 hours.
Capturing video via contact lens means people have to stare at things uninterrupted. Assuming, no that video stops the moment people close their eyelids video length will be limited to maximum staring"
K N. - "Assumptions
Contact lens camera is launched only in the US
Ages most likely to benefit 20-60
Doesn't work with prescription i.e. people who have prescription glasses/contact lens are not the target market
Can't be worn all the time max of 10 hours.
Capturing video via contact lens means people have to stare at things uninterrupted. Assuming, no that video stops the moment people close their eyelids video length will be limited to maximum staring"See full answer
"Clarifying and Assumptions
When we say New York City, does this mean just Downtown New York or also the suburbs? Assumption: It means Downtown New York only.
Is the bike-sharing service like Uber, where people share their own bikes, or is it a service run by a company with bike stands on street corners? Assumption: It’s run by a private company with bike stands on street corners.
Will the bike-sharing service start as free, or will we charge people from the beginning?"
Darpan D. - "Clarifying and Assumptions
When we say New York City, does this mean just Downtown New York or also the suburbs? Assumption: It means Downtown New York only.
Is the bike-sharing service like Uber, where people share their own bikes, or is it a service run by a company with bike stands on street corners? Assumption: It’s run by a private company with bike stands on street corners.
Will the bike-sharing service start as free, or will we charge people from the beginning?"See full answer
"Clarify
can we limit traffic to normal commute time for people going to work in their city? Not include business travel? (Recognize traffic can mean: pick up drop off kids; errands, grocery, shopping, social, people who drive for their job etc.)
limit to US?
pre-covid time?
Equation
\# of working people in US x # of hours commute per year per person
\# of working people in US
320M total population, 40M per age group of 10 years
working age = 20 to 70, 5 groups of 1"
Anonymous Cricket - "Clarify
can we limit traffic to normal commute time for people going to work in their city? Not include business travel? (Recognize traffic can mean: pick up drop off kids; errands, grocery, shopping, social, people who drive for their job etc.)
limit to US?
pre-covid time?
Equation
\# of working people in US x # of hours commute per year per person
\# of working people in US
320M total population, 40M per age group of 10 years
working age = 20 to 70, 5 groups of 1"See full answer
"Since I am residing in Bangalore, I will consider the Bengaluru airport. The airport has 2 terminals. I am going to consider the security scan done at both the terminals for the estimation.
Does it include security scans for both international and domestic flights? --> Both
The airport crew members and pilots also go through the security scan. So, should I include only them as well or only the passengers in my calculation? --> Only the passengers
Number of people going through the security scan"
Sangeeta P. - "Since I am residing in Bangalore, I will consider the Bengaluru airport. The airport has 2 terminals. I am going to consider the security scan done at both the terminals for the estimation.
Does it include security scans for both international and domestic flights? --> Both
The airport crew members and pilots also go through the security scan. So, should I include only them as well or only the passengers in my calculation? --> Only the passengers
Number of people going through the security scan"See full answer
"First I would like to ask you some clarifying questions.
Timeframe: do we consider a single given day? YES
What is the definition of jogger? Running, not walking
Is there a minimum distance? NO
Do you count only the distance within the perimeter of central park or also the miles getting in and out of CP to my start location? ONLY CP
Great, I would like to structure the problem this way.
\# of aggregated miles run by jogger in a day in CP = # of joggers per day * av"
Fabio E. - "First I would like to ask you some clarifying questions.
Timeframe: do we consider a single given day? YES
What is the definition of jogger? Running, not walking
Is there a minimum distance? NO
Do you count only the distance within the perimeter of central park or also the miles getting in and out of CP to my start location? ONLY CP
Great, I would like to structure the problem this way.
\# of aggregated miles run by jogger in a day in CP = # of joggers per day * av"See full answer
Asked at Google • Estimation
Estimation
