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Arithmetic Reasoning - Verbal and Reasoning

Q1:

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

ANS:B - 124

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.