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Work done by 5 men in a day is equal to the work done by 12 children in a day. Find the ratio of their per person efficiencies.

Work done by 5 men in a day is equal to the work done by 12 children in a day. Find the ratio of their per person efficiencies. Correct Answer 144 : 25

The efficiency of 5 men = (lcm of 5 and 12) / 5 = 12 The efficiency of 1 man = 12 / 5 The efficiency of 12 boys = (lcm of 5 and 12) / 12 = 5 The efficiency of 1 boy = 5 / 12 Their ratios = 12 / 5 : 5 / 12 = 144 : 25

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