Multiple choice general knowledge math & puzzles

A sum of Rs. 8.25 is made up of 100 coins which are either 10 paise or 5 paise. How many are there of 10 paise?

  1. 65

  2. 55

  3. 75

  4. 60
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A Correct answer
Explanation

Let x be the number of 10 paise coins. The number of 5 paise coins is 100 - x. The equation is 10x + 5(100 - x) = 825. Solving this gives 5x + 500 = 825, so 5x = 325, yielding x = 65.

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