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

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

A144

B200

C124

D120

Answer:

C. 124

Read Explanation:

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

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