Questio 28

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waecmaths question: 

In an examination, Kofi scored x% in Physics, 50% in Chemistry and 70% in Biology. If the mean score for the three subjects was 55%, find x

Option A: 

40

Option B: 

45

Option C: 

55

Option D: 

60

waecmaths solution: 

$\begin{array}{*{35}{l}}   & \bar{x}=55percent  \\   & \bar{x}=\frac{x+50+70}{3}  \\   & x+120percent=165percent  \\   & x=45percent  \\\end{array}$

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