A purse contains some Rs. 5 coins and some Rs. 10 coins . If the total number of this coins is 20 and the total value of this coins is Rs. 165 , Find the number of Rs. 10 coins in the purse.
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Solution
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 AQ, 10x+100-5x=165 5x=165-100 X=65/5=13 Hence, the no. of Rs 10 coins=x=13 Rs 5 coins=20-13=7