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
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
\(\frac{x + 50 + 70}{3} = 55\)
x + 120 = 3(55)
x + 120 = 165
= 165 - 120
x = 45%
Source: Myschool Past Questions Archive (Record #36456)