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A certain number of men can do a work in 60 days. If there were 8 men more it could have finished in 10 days less. How many men were there?
Question

A certain number of men can do a work in 60 days. If there were 8 men more it could have finished in 10 days less. How many men were there?

A.

20 men

B.

40 men

C.

60 men

D.

None of these

Correct option is B

Given
Time 1 = 60 days, Extra men = 8, Time 2 = 50 days (10 days less)

Formula Used
​M1D1=M2D2M_1 D_1 = M_2 D_2​​

Solution
​x×60=(x+8)×5060x=50x+40010x=400=>x=40menx \times 60 = (x + 8) \times 50 \\60x = 50x + 400\\10x = 400 \Rightarrow x = 40 men​​
Final Answer
So the correct answer is (b)

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