A total of 324 coins of 20 paise and 25 paise make a sum of Rs. 71. The number of 25 paise coins is

Options

A. 120
B. 124
C. 144
D. 200

Answer

B

Explanation

Let the number of 20 paise coins = x
Then, the number of 25 paise coins = `(324 - x)`.
According to the question, `20x + 25 (324 - x)= 7100 `
[Convert rupees into paise]
or, `20x + 8100 - 25x = 7100 ` [`because` 1 Rupee = 100 paise]
or `5x = 1000 `or, `x = 200 `
Therefore, required number of 25 paise coins = `(324 - x) `
`= (324 - 200) `
`= 124`