exam Exam Numerical Ability

A Garrison of 3300 men had provision for 32days,when given at the rate of 850gm per head.At the end of 7days,a reinforcement arrived and it was found that the provision would last 17 days more,when given at the rate of 825 gm per head.What was the strength of the reinforcement?

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Two men,Vikas and Vishal,working separately can mow a field in 8 and 12hours respectively.If they have work in stretches of one hour respectively,Vikas beginning at 8a.m,when will the mowing be finished? If the selling price is doubled, the profit triples. The profit percent is