Question

Six men can complete the electrical wiring of a house in 7 days.In how many days 21 men can do this work.

Answer 1

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.