Correct Answer - Option 4 : 50
Given:
Total students = 40
Calculation:
According to the question:
Number of girls = 40% of 40
⇒ (40 × 40)/100 = 16
Number of boys = 40 - 16 = 24
Let average score of girls be x
Then, average score of boys = 140x/100 = 7x/5
Again,
16 × x + 24 × 7x/5 = 40 × 62
⇒ (80x + 168x)/5 = 40 × 62
⇒ 248x = 40 × 62 × 5
⇒ x = (40 × 62 × 5)/248 = 50
∴ The average score of girls are 50.