Two pipes A & B would fill a tank in 20 & 30 minutes respectively. Both pipes being open, find when A must be turned off so that tank may be just filled in 15 minutes.

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Nazir can wash his car 15 minutes while his son takes twice as long. If they work together how many minutes will the job take them?

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A batsman in his 17th innings makes a score of 85 and thereby increases his average by 3, his average after the 17th innings is :

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Income of A is 25% less than B. How much percent B's income would be more than that of A?

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What percentage of profit is made by selling an article at a certain price if by selling at two third of that price there would be a loss of 20%?

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A general wishing to draw up his 7250 men in the form of a solid square found that he had 95 men over. What is the number of men in the front row?

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