Mixture and Alligation

Quantitative Aptitude (CDS)

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A dishonest milkman professes to sell his milk at cost price but he mixes it with water and thereby gains 30%. The percentage of water in the mixture is?

10%

15%

30%

25%

Explanation:

We will apply alligaton on % profit. If he sells the
milk at CP, he gains 0%. But if he sells water at CP, he
gains 100%.
Therefore ,
Ratio of milk to water in the mixture should be = 100 – 30 / 30 – 0
= 70 /30 = 7/3
Thus , % of water in mixture = 3 × 100 / 3+7
= 3×100/10
= 30%

By: bhavesh kumar singh

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