A purse has only two rupees and five rupees coin. The sum of the coins is 36 and the total value of the coins is 84 . Find the no. Of five rupees coins
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Answered by
6
there are 4 no.of five rupees coins
noorealam:
how
let the number of two rupees coin be X and five rupees coin be Y. according to que 2x+5y=84........(i) x+y=36.........(ii) elimination method ,substracting eqn (ii) from (i),we get 3y=12.now y=4..........thus,there are 4 no. of five coins.....
Answered by
11
let 2 rupee=x, let 5 rupee=y,
so,x + y = 36, x = 36-y
therefore,
2x+5y=84,
2(36-y)+5y=84=72-2y+5y=84,
-2y+5y=84-72 , 3y=12y=4
so,x + y = 36, x = 36-y
therefore,
2x+5y=84,
2(36-y)+5y=84=72-2y+5y=84,
-2y+5y=84-72 , 3y=12y=4
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