Question

A total of 324 coins of 20 paise and 25 paise make a sum of Rs. 71. The number of 25 paise coins is:

• A. 144
• B. 200
• C. 124
• D. 120

Answer 1

Answer:

C. 124

Let the number of 25 paise coins = y ⇒ No of 20 paise coins = 324 - y y × 25/100 + (324 - y) × 20/100 = Rs.71 ⇒ y/4 + (324 - y)× 1/5 = 71 ⇒ y/4 + 324/5 - y/5 = 71 ⇒ y/20 = 71 - 324/5 ⇒ y/20 = 31/5 ⇒ y = 124