Out of 90 students in a class, 60% are girls and rest are boys. The average score in English of boys is 30% more than that of girls. If the average score in English of all the students is 56, then what is the same for the girls?
Answer & explanation
Correct answer: option 4
Ratio of number of boys to girls is = 2 : 3
So , number of boys = \(\frac{90}{5}\) × 2 = 36 & number of girls = 90 - 36 = 54
Ratio of marks of boys to girls = 13 : 10
ATQ,
36 × 13R + 54 × 10R = 90 × 56
468R + 540R = 5040
R = \(\frac{5040}{1008}\) = 5
Average score of girls = 10R = 10 × 5 = 50