Question

in a class the number of girls is 20% more than that of boys the strength of the class is 770. if 5 more girls are admitted to the class the ratio of boys and girls

Answer 1

let no of boys in class =x
=> no of girls =x+x/5 according to question
x+6x/5= 770
=>11x=3850
=>x=350
=>no of girls =420
if 5 girls are admitted then no of girls=425
ratio between boys and girls is=350/425
14:17

Answer 2

According to the question,

(5 + 6)units = 66

11 units = 66

1 unit = 6

Hence Boys = 6×5=306×5=30

girls 6×6=366×6=36

The number of girls when 4 is admitted

= (36 + 4) = 40

Required ratio = 30 : 40 = 3 : 4