A) 86.4
B) 86.1
C) 86.5
D) 85.9
Correct Answer: B
Solution :
[b] Let the number of girls and boys in the class are 4x and 5x, respectively. Then, Average marks of whole class \[=\frac{85\times 4x+87\times 5x}{4x+5x}\] \[=\frac{340x+435x}{9x}=\frac{775x}{9x}=86.1\] |
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