Question

There are total 100 coins consisting of 20 paise, 50 paise, rs.1 in the ratio of 7:8:5. what is the no. of coins of 50 paise if the difference between the amount yielded by 20 paise and rs. 1 coin is 18?

Answer 1

$20 \times 5 = 100 = 1rs$
$7 \times 8 \times 5 = 280$