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Q.

If 20 men can build a wall 56m long in 6 days, what length of a similar wall can be built by 35 men in 3 days?

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a

49 m

b

50 m

c

42 m

d

51 m

answer is A.

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Detailed Solution

If N number of people can do a piece of work in T hours, then the total effort or total work done is equal to NT. If a person can do a work in D days then, then the work done by that person in 1 day is 1D. In number N1 of people can do W1 amount of work in D1 days working H1 hours per day and N2 number of people can do W2 amount of work in D2 days then,

Substitute the known values in the above equation, we get
Question Image

Question Image

Hence, the correct option is 1.

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