Question : The average mark of 50 students in a class is 72. The average marks of boys and girls in that subject are 70 and 75, respectively. The number of boys in the class is:
Option 1: 20
Option 2: 35
Option 3: 25
Option 4: 30
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Correct Answer: 30
Solution :
Average of 50 students = 72
Total score of 50 students = 72
The total score of boys = 70
Where
⇒ Total score of girls = 75(50 –
According to the question,
70
⇒ 70
⇒ 5
Hence, the correct answer is 30.
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