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391.In what proportion must water be added to spirit to gain 20% by selling it at the cost price?
392.Jameel invested an amount of Rs.17400 for two years. Find the rate of compound interest that will fetch him an amount of Rs.1783.50 at the end of two years?
393.Kamal will complete work in 20 days. If Suresh is 25% more efficient than Kamal, he can complete the work in____days.
394.LCM of 1/3, 5/6, 5/4, 10/7 is____?
395.LCM of 18 and 27 is____?
396.LCM of 455, 117, 338 is____?
397.LCM of 87 and 145 is____?
398.Least perfect square number, exactly divisible by 21, 36 and 56 is____?
399.On decreasing the price of T.V. sets by 30 % its sale is increased by 20 %. What is the effect on the revenue received by the shopkeeper?
400.Out of 15 consecutive numbers, 2 are chosen at random. The probability that they are both odds or both primes is____?