Question

10 people take 8 days to build a wall.

How long will it take 4 people to do the same job?

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Answer 1

20 days

Explanation:

10 to get to 4 needs to be divided by 2.5 so we do the opposite to the other side since with fewer people it would take longer. (2.5 times longer).

10/2.5 = 4

8x2.5 = 20 days