The table above shows that the scores of a grou... - JAMB Mathematics 2005 Question
A
1
B
2
C
3
D
4
correct option: b
\(mean=\frac{60+5x}{18+x}\3.5=\frac{60+5x}{18+x}\\frac{7}{2}=\frac{60+5x}{18+x}\)
7(18+x) = 2(60+5x)
126 + 7x = 120 + 10x
10x - 7x = 126 - 120
3x = 6
x = 2
7(18+x) = 2(60+5x)
126 + 7x = 120 + 10x
10x - 7x = 126 - 120
3x = 6
x = 2
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