A dishonest milkman professes to sell his milk at cost price but he mixes with water ...........

Quant (SSC) Mixture and Alligation

A dishonest milkman professes to sell his milk at cost price but he mixes with water and there by gains 20% .The percentage of water in the mixture is?

25%

15%

13.45%

16.67%

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Explanation:

P of 1 liter milk = Re 1.
S.P of 1 liter mixture=Re 1. Gain=20%
C.P of 1 liter mixture =Re(100/120*1) = Re 5/6.
C.P of 1 liter milk Re 1 C.P of 1 liter of water 0
5/6
5/6 1/6
Ratio of milk to water =5/6 : 1/6 = 5:1
% of water in the mixture=1/6*100=16.67%