Question

Arvind has a piggy bank. It is full of one rupee and fifty paisa coins. It contains 3 times as many fifty paisa coins as one rupee coins. The total amount of money in bank is Rs35. How many coins of each type are there in piggy bank?

Answer 1

Let the number of 1 rupee coin be x 
Then number of 50 paise coin = 3x

Total amount = x+1.5x = 2.5x = 35 ⇒ x=14

Answer 2

let us assume that the number of coins of 1 rupee are x

therefore coins of 50 paisa are 3x

amount of 1 rupee coin = 1×x=100x paisa

amount of 50 paisa coins=50×3x=150 paisa

100x+150x=4500

250x=4500

x=18

hope it helps you