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WAEC Mathematics 2014 Question 26

Question 26

Linear and Simultaneous Equations

A box contains 13 currency notes, all of which are either ₦50 or ₦20 notes. The total value of the currency notes is ₦530. How many ₦50 notes are in the box?

  1. A.4
  2. B.6
  3. C.8
  4. D.9
Show the answer and explanation

Answer: D (9)

Explanation

50x + 20(13 − x) = 530 gives 30x + 260 = 530, so x = 9.