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
124
144
200
[A].
[B].
[C].
[D].
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.