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A purse contains some Rs 5 coins and some Rs 10 coins. if the total number of these coins is 20 and the total value of these coins is Rs 165; find the

number of Rs 10 coins in the purse.


Let   the total no. of Rs 10 coins be x.
 Hence no. of Rs 5 coins=20-x
 Value of
Rs. 10 coins=10x
 Rs. 5 coins=5(20-x) =100-5x
 A\Q, 10x+100-5x=165
 Hence, the no.
of Rs 10 coins=x=13
 Rs 5 coins=20-13=7

1 5 1
Total number of rs10 coins are 13
as 13*10=130. and coins left are 7 coins 
so theywould be of rs 5 coins as 5*7=35
and 13+7=20             130+35=165
0 0 0
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