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Railways PYQCBT 1 2016

RRB NTPC · Question 49

There are 90 coins, comprising 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

  1. C

  2. D

  3. B

  4. A

Show answer & explanation

Answer: (A) C

Explanation

Let there be x five-paisa coins and (90 − x) ten-paisa coins. Total value = 5x + 10(90 − x) = 700 paise, so 900 − 5x = 700 and x = 40. There are 40 five-paisa coins and 50 ten-paisa coins.