Question

There are 90 coins, comprising of 5 and 10 paisa coins. The value of all the coins is Rs. 7. How many 5 paisa coins are there?

• A. 50
• B. 45
• C. 40
• D. 35

Answer 1

Answer:

C. 40

Let 5 paise coin = x Let 10 paise coin = (90 – x) ATQ, 7 × 100 = 5x + 10 (90 – x) 700 = 5x + 900 – 10x ⇒ 5x-10x = 700-900 ⇒ -5x = -200 ⇒ x = 200 ÷ 5 ⇒ x = 40 ∴ 5 paise coin = 40 coins