WAEC Mathematics 2014 Objective — Question 26

Question 26 of 50 from the West African Examinations Council (WAEC) Mathematics 2014 Objective paper, with the correct answer and a full explanation.

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?

A. 4
B. 6
C. 8
D. 9Correct

Explanation

Let x=#50 notes, y=#20 notes. x+y=13 and 50x+20y=530. Solving simultaneously gives x=9.

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