Question 26

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waecmaths question: 

A box contains 13 current notes, all of which are either N50 or N20 notes. The total value of the currency notes is N530. How many N50 notes are in the box?

Option A: 

4

Option B: 

6

Option C: 

8

Option D: 

9

waecmaths solution: 

$\begin{align}
& \text{Let the number of N50 notes be }x \\
& \text{Let the number of N20 notes be }y \\
& 50x+20y=530---(i) \\
& x+y=13---(ii) \\
& y=13-x \\
& 50x+20(13-x)=530 \\
& 50x+260-20x=530 \\
& 30x+260=530 \\
& 30x=270 \\
& x=9 \\
& \\
\end{align}$

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