Question

6 Men complete the electric feeling in a building 7 days. How many days it take 21 men to do the job?

Answer 1

here your answer- 6 men can complete the electricfittings in a building in 7 days means the job involves 6*7 = 42 man-days of effort. If 21 men are employed, it should take, theoretically speaking, just 42/21 = 2 days.

Answer 2

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This problem can be solved by Unitary method.

If 6 men can complete the electric fitting in a building in 7 days,

then 1 man will need 6 x 7 = 42 days to complete it.

Similarly 21 men can complete the job in 42/21 = 2 days.