Exam Maths Puzzle Logical Reasoning

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Exam Other Question
a piece of work can be completed by 18 men in 10 days working 18 hours a day at 80% efficiency . how many men are needed to complete another work twice as great in 40 days working 6 hours a day at 90 % efficincy How many pairs of natural numbers are there so that the difference of their squares is 60?