The average score of 65 students in a test is 50 . The ratio of the number of boys to that of girls is 4 : 5 . The average score of the girls is 20% more than that boys. The average score of boys is?
Answer & explanation
Correct answer: option 4
Ratio of no. of students
Boys : Girls
4 : 5
Ratio of avg. score : 20% = \(\frac{1}{5}\)
Ratio of score of , Boys : Girls
5R : 6R
According to question ,
(4 × 5R) + (5 × 6R) = 9 × 50
50R = 450
R = 9
Average score of boys = 5 × 9 = 45