In an examination Kofi scored x in Physics 50 i... - WAEC Mathematics 2009 Question
In an examination, Kofi scored x% in Physics, 50% in Chemistry and 70% in Biology. If his mean score for the three subjects was 55%, find x
A
40
B
45
C
55
D
60
correct option: b
\(\frac{x + 50 + 70}{3} = 55\)
x + 120 = 3(55)
x + 120 = 165
= 165 - 120
x = 45%
x + 120 = 3(55)
x + 120 = 165
= 165 - 120
x = 45%
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