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Question

If 28 men can do a piece of work in 7 days, then how many men are required to complete that work in 4 days?

A
45 men
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B
42 men
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C
50 men
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D
49 men
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Solution

The correct option is D 49 men
Given,
28 men can do a piece of work in 7days.

We know that if the work is needed to be completed in less days, then the number of men required will be more.

So, Number of days(x)1Number of men(y)
x1x2 = y2y1

Given,
x1 = 7 days
y1 = 28 men
x2 = 4 days
and y2 = Number of men required tofinish the work in 4 days
y2 = x1 × y1x2
y2 = 7 × 284 = 49 men

Hence, 49 men are required to complete that work in 4 days.

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