A bag contains 5 rupee, 2 rupee, 1 rupee and 50 paise coins in the proportion 1 : 2 : 3 : 4. If the total amount in the bag is ₹168, then how many 50 paise coins are there?

48

Rs 5 : Rs 2 : Re 1 : 50p

  1   :   2    :   3    :  4

⇒ 5 x 1 : 2 x 2 : 1 x 3 : 0.5 x 4 

⇒ (5 + 4 + 3 + 2)units = Rs. 168

⇒ 14 units = 168,

⇒ 1 unit = Rs. 12

⇒ No. of 50 paise coins = 4 x 12 = 48.