A dishonest milkman prefers 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, a. 4% b. 614 % c. 20% d. 25%

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What is the formula of \[{x^2} + {y^2} + {z^2}?\

What is a dodging number?

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How many perfect cubes can you find from 1 to 100? How many from -100 to 100?