Question : The average mark of 60 students in a class is 62. The average marks of boys and girls in that subject are 60 and 65, respectively. The number of boys in the class is:
Option 1: 36
Option 2: 25
Option 3: 41
Option 4: 34
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Correct Answer: 36
Solution :
Using the rule of alligation, we get,
So, boys : girls = 3 : 2
Total students = 60
$\therefore$ Number of boys $=\frac{3}{3+2}×60=36$
Hence, the correct answer is 36.
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