"Solution:
World population = 8B
Assuming 10% of world population does not use detergent( using only soap or using only water)
Remaining population = 90/100 * 8B = 7.2B ~ 7B
Diving the users into 3 categories
Users who wash everyday
Users who wash twice a week
Users who wash once a week
Wash everyday --- Wash twice a week --- Wash once a week
Used clothes < Used clothes < Used clothes
5gm --- 10gm --- 15gm (Detergent used"
Reshma R. - "Solution:
World population = 8B
Assuming 10% of world population does not use detergent( using only soap or using only water)
Remaining population = 90/100 * 8B = 7.2B ~ 7B
Diving the users into 3 categories
Users who wash everyday
Users who wash twice a week
Users who wash once a week
Wash everyday --- Wash twice a week --- Wash once a week
Used clothes < Used clothes < Used clothes
5gm --- 10gm --- 15gm (Detergent used"See full answer