Multiple choice

Daniel had 10 paise, 25 paise and 50 paise coins in the ratio of 5 : 4: 9 respectively. After giving Rs. 30 to his mother he has Rs. 30. How many 50 paise coins did he have?

  1. 50

  2. 90

  3. 70

  4. 80

  5. 60

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let coins be 5x, 4x, 9x for 10p, 25p, 50p. Total value = 5x × 0.10 + 4x × 0.25 + 9x × 0.50 = 0.5x + x + 4.5x = 6x rupees. After giving Rs. 30, remaining = Rs. 30, so original total = Rs. 60. Then 6x = 60, x = 10. Number of 50p coins = 9x = 90.