Exam Maths Puzzle Numerical Ability Age Problem

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

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Exam Other Question
Ravana spends 30% of his salary on house rent, 30% of the rest he spends on his children’s education and 24% of the total salary he spends on clothes. After his expenditure, he is left with Rs 2500. What is Ravana’s salary ? H A T
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