The average score of a class of boys and girls in an examination is A. The ratio of boys and girls in the class is 3 : 1. If the average score of the boys is A + 1, the average score of the girls is-
A. A - 1
B. A - 3
C. A + 1
D. A + 3
Answer: Option B
Solution (By Examveda Team)
Let the number of boys and girls in the class be 3x and x respectively.Let the average score of the girls be y.
Then,
⇒ 3x (A + 1) + xy = (3x + x) A
⇒ 3 (A + 1) y = 4A
⇒ y = A - 3
This Question Belongs to Arithmetic Ability >> Average
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