A bag contain the total of 90 coins in the form of 20 paise and 25 paise coins. If the total value of coins is 21. Find the number of coins?
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20p coins = x
25p coins = 90 -x
20x + 25(90-x) = 2100
20x + 2250 - 25x = 2100
5x = 2250 - 2100 = 150
x = 30
20p coins = 30
25p coins = 90 - 30 = 60
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