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Question

Solve the following.

5 men can build a wall 20ft long in 7 days. Find the length of the wall built by 13 men in 21 days?

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Solution

Let x be the length of wall made by 13 men in 21 days.

Length of wall increases, when the required number of men increase.

This is direct proportion.

The detailed proportions are:

Men

Days

Length

5

7

20

13

21

x

Thus, length of the wall made by 13 men in 21 days is 156 ft.


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