A total of 324 coins of 20 paise and 25 paise make a sum of Rs. 71. The number of 25-paise coins is	Select the correct option:
A) 120  B) 124  C) 144  D) 200  E) 220
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.   Answer:124
<result>B</result>
A total of 324 coins of 20 paise and 25 paise make a sum of Rs. 71. The number of 25-paise coins is