Question

A purse has some Rs.2-coins and Rs.5-coins.the total value of the coins is Rs 165.if the number of Rs.5-coins are 5 more then the Rs 2 coins.find how many coins ofeach are there in the purse.

Answer 1

$2(x) + 5(x + 5) = 165 \\ = 2x + 5x + 25 = 165 \\ = 7x = 165 - 25 \\ = 7x = 140 \\ = x = \frac{140}{7} \\ = x = 20$
there are 20 2rupee coins and 25 5rupee coins