Atul purchased Bread costing ₹20 and gave a 100 rupee note to the shopkeeper. The shopkeeper gave the balance money in coins of denomination ₹2, ₹5 and ₹10. If these coins are in the ratio 5 : 4: 1, then how many ₹5 coins did the shopkeeper give ?

8

                        ₹2  :  ₹5  :  ₹10

Denomination      5  :    4  :   1

Total money = ₹80

(2 x 5r) + (5 x 4r) + (10 x r) = 80

⇒ 10r + 20r + 10r  = 80

⇒                    40r = 80                    

⇒                       r = 2

No. of coins of ₹5 = 4 x 2 = 8