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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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].

120

[B].

124

[C].

144

[D].

200

Answer: Option B

Explanation:

Let the number of 20-paise coins be x. Then, number of 25-paise coins = (324 – x).

Therefore 0.20 x x + 0.25 (324 – x) = 71 20x + 25 (324 – x) = 7100

5x= 1000 x = 200. Hence, number of 25-paise coins = (324 – x) – 124.