Multiple choice general knowledge math & puzzles

A sum of Rs. 19 is made up of 50 coins which are either 20 paise coins and 50 paise coins. Find the number of 20 paise coins.

  1. 10

  2. 25

  3. 40

  4. 30

  5. 20
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Let x = number of 20 paise coins and y = number of 50 paise coins. We have: x + y = 50 and 20x + 50y = 1900 paise (converting Rs. 19 to paise). From x + y = 50, x = 50 - y. Substituting: 20(50 - y) + 50y = 1900, giving 1000 - 20y + 50y = 1900, so 30y = 900 and y = 30. Therefore x = 50 - 30 = 20. There are 20 twenty-paise coins. Option E is correct.

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