purse contains some Rs.5 coins and some RS.10 coins.if the total no. of these coins is 20 and the total value of these coins is Rs.165; find the no. of Rs.10 coins in the purse.
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let the no. of rs5 coins be x
then the no. of RS.10 will be 20-x
given that total value of coins is Rs.165
5x+10(20-x)=165
5x+200-10x=165
5x=35
x=7
10Rs coins=20-7=13 ans.
then the no. of RS.10 will be 20-x
given that total value of coins is Rs.165
5x+10(20-x)=165
5x+200-10x=165
5x=35
x=7
10Rs coins=20-7=13 ans.
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13 coins 5*7=35+10*13=130 total 165 so 13 of 10rs.
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