SOLUTION: a total of 324 coins of 20 paise and 25 paise make a sum of Rs 71, then the number of 25 paise coins is.........

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Question 769402: a total of 324 coins of 20 paise and 25 paise make a sum of Rs 71, then the number of 25 paise coins is.........
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a total of 324 coins of 20 paise and 25 paise make a sum of  Rs 71, then the number of 25 paise coins is.........
Ans:
Let number of 25 paise coins be x
Then number of 20 paise coins = (324 - x)
Value of the 25 paise coins = (25*x) paise
Value of the 20 paise coins = (20*(324 - x)) paise
Total value = Rs 71 = 7100 paise
So we have the equation
25%2Ax+%2B+20%2A%28324+-+x%29+=+7100 Solve for x
25%2Ax+%2B+6480+-+20%2Ax+=+7100
5%2Ax+=+7100+-+6480+=+620
x+=+620%2F5+=+124
No. of 25p coins = 124
No. of 20p coins = 324 - 124 = 200
:)