Given: The ratio of Rs.1 , 50 paise and 25 paise coins is 5 : 7 : 9. Total money in bag = Rs. 430 Calculations: Let the number of Re.1 be 5x 50 paise coins be 7x, And 25 paise be 9x We know that, Rs.1 = 100 paise ⇒ Rs. 430 = 43000 paise The given data can be written as follows: (1×100×5x)+(50×7x)+(25×9x)=43000 ⇒ 500x+350x+225x=43000 ⇒ 1075x=43000 ⇒ x=
43000
1075
⇒ x = 40 Now, we have to find the number of 50 paise coins = 7 × 40 = 280 ∴ The number of 50 paise coins is 280.