A milkman professes to sell his milk at cost price but he mixes it with water and thereby gains 25%. The percentage of water in the mixture is: Select:	A) 4%	B) 6(1/4)%	C) 20%	D) 25%	E) 30%
Explanation:   Let C.P. of 1 litre milk be Re. 1   Then, S.P. of 1 litre of mixture = Re. 1, Gain = 25%.   C.P. of 1 litre mixture = Re. 100	x 1 =	4   125	5   By the rule of alligation, we have:   Ratio of milk to water =	4/5 : 1/5 =4:1.   Hence, percentage of water in the mixture =(1/5 x 100)%=20%   ANSWER IS 20%
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A milkman professes to sell his milk at cost price but he mixes it with water and thereby gains 25%. The percentage of water in the mixture is: