A) 396
B) 400
C) 408
D) 416
Correct Answer: A
Solution :
Let the number of students be a. Then, \[7=\frac{n\times 6+12\times 40}{n+12}\Rightarrow 7n+84=6n+480\] \[n=480-84=396\]You need to login to perform this action.
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