A total of 324 coins of 20 paise and 25 paise...

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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

A. 120

B. 124

C. 144

D. 200

Answer: Option B

Solution (By Examveda Team)

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.

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Comments (1)

PRATEEK JAIN:

7 years ago

Not understand

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