If 15 men can build a wall of forty two metres long in 5 days, what length of a similar wall can be built by 25 men in 4 days

48 metres

56 metres

60 metres

62 metres

Solution: Let the required length be x metres. More men, more length built (Direct proportion) Less days, less length built (Direct proportion) men 15 : 25 days 5 : 4 .'.(15*5*x) = (25*4*42) x = 56 metres.

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