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in a mixture of 60lts the ratio of milk and water is 2:1.if the ratio of milk and water is to be 1:2.what is the amount of water(in lts) to be further added?

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a trader sells total 315 tv sets.he sells black and white tv sets at a loss of 6% and color tv sets at a profit of 15% thus he gains 9% on the whole.what are the no. of blak and white sets which he has sold? if 50% of the 2:3 solution of milk and water is replaced with water.what concentration of the solution is reduced