Question

4 people makes a house in 1 month then how much does it takes to make a house for 5 people?
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Answer 1

4/5 month.

Explanation:

Since 4 people can make a house in one month, we can let the total amount of work be 1. So each people completed: 1/4 of the project. so for five people, the wrok efficiency is 5*1/4=5/4. So we divde te total amount of work 1 y the work efficiency: 1/(5/4)=4/5.