Question

a sum of rs. 8.25 is made up of 100 coins which are either 10 paise or 5 paise. how many are there of 10 paise?

Answer 1

8.25 rupees=825 paise let the number of 5 paise coin be x and the number of 10 paise coin be y now,a/q x+y=100..............1 again total value of 5 paise and 10 paise is 825 paise.so, 5x+10y=825...........2 from equation 1 and 2 after solving, y=65 coins and x=35 coins checking, 65*10+35*5=825 650+175=825 825=825 also 65+35=100