Mr. X lot a wallet containing Tk. 120. Incidentally, he had only lots of Tk. 2 Tk.3 and Tk.5 denominations in the wallet. If the total number of notes was 30, how many Tk. 5 denomination notes did he has?

Correct Answer: 18
Suppose, number of 5 taka note = x number of 2 taka note = (30 - x) Here, 5x + 2(30 - x) = 120 ⇒ 5x + 60 - 2x = 120 ⇒3x = 60 .:. x = 20 So, total 5 taka note = 20