Question

Rajesh has Rs 500 in terms of Rs 1, Rs 2 and Rs 5 coins. The ratio between Rs 1, Rs 2 and Rs 5 coins is 10: 5: 1. Find the number of coins of Rs 5.

Answer 1

Rus *  number of coin = total amount

• we have 1,2 and 5 ru coins

1x+2y+5z=500

• from ratio

x=10a=number of 1rus coin

y=5a=number of 2rus coin

z=1a=number of 5rus coin

1(10a)+2(5a)+5(a)=500

10a+10a+5a=500

a=20

• Our aim is to find number of 5rus coin

z=1a

answer :

z=20 number of rus5 coin.