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
- 40
-
45
- 55
- 60
The correct answer is: B
Explanation
\(\frac{x + 50 + 70}{3} = 55\)x + 120 = 3(55)
x + 120 = 165
= 165 - 120
x = 45%