Question

Q1. In a school, ratio of boys to girls is 5:7. The total number of students is 660.This year 25 new boys joined and 35 girls left the school. Find the ratio of boys to girls this year.​

Answer 1

Answer:

This is another way of saying that 7 out of every 12 students is a boy and 5 out of every 12 is a girl (7+5=12). We can use this information to determine the percentages of the mix:

Percentage of boys is: 7÷12=0.58×100=58%

Percentage of girls is: 5÷12=0.42×100=42%

The # of boys in the class = 60×0.58=35

The # of girls in the class = 60×0.42=25

Thus, there are 35-25=10 more boys than girls in the class.