In a class the average of boys and girls is 'A'. The ratio of number of boys and number of girls is 3: 1 and the average of the boys is A + 1. Find the average of girls.
Answer & explanation
Correct answer: option 1
Boys : Girls
3 : 1 = 4
Let the average of girls = x
ATQ,
4A = 3 (A+1) + 1x
⇒ x = 4A - 3A - 3
x = A - 3