Question

purse has only two Rupee and five rupee coins the sum of the coins is 36 and the total value of the coins is 84 find the number of 5 rupee coins

Answer 1

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let 2 rupee=x,
let 5 rupee=y, 
so, x + y = 36,  
x = 36-y therefore, 
2x+5y=84,
2(36-y)+5
=84
 =72-2y+5y=84,  
-2y+5y=84-72 ,  
3y=12 y=4.