A sum of Rs. 36.90 is made up of 180 coins which are either 10 paise coins or 25 p coins. The number of 10 p coins is: ( A ) 48 ( B ) 54 ( C ) 56 ( D ) 60
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let number of 10 paise be x
let number of 25 paise be y
10x + 25y = 3690
x + y = 180
by elimination method
10x + 25y = 3690
x. + y. = 180× 10
10x + 25y = 3690
10x + 10y = 1800
-. -
15y= 1890
y = 126
x= 54
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