The average of 20, 70 and x is 40. If the average of 20, 70, x and y is 50, then y = ?

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What is the total interest on Tk. 800 at 12.5% per annum for 9 months in Taka?

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Find the number of the divisors of 540.

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In a mixture of 30 liters, the ratio of acid and water is 7 : 3. How much more water is to be added to get a new mixture containing acid and water in the ratio of 3 : 7?

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