The mean weight of 100 students in a class is 46 kg. The mean weight of boys is 50 and of girls is 40 kg. Therefore, the number of boys is:

A. 50

B. 60

C. 70

D. 65

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Answer-B
Solution-

Solution(By Apex Team)

 
Let number of boys are x and then number of girls = (100 – x) Thus, 50x + (100 – x) × 40 = 46 × 100 → x = 60 Number of boys = 60

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