Discussion
A dishonest milkman wanted 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 :
Answer: B
Water makes up 20% of the mixture.
Selling the mixture at the cost price of milk and gaining 25% means that for every 100 units of milk he pays for, he sells 125 units. The extra 25 units are water.
\[ \text{water} \% = \frac{25}{125} \times 100 = 20\% \]
The trap is 25%, which is water as a share of the milk, not of the mixture. The question asks for its share of the mixture.
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