Question

In a school the total number of students was 160 in the year of 2015.In the following year,the number of girls decreased by 20 and the number of boys increased by 20.As a result,the number of boys became 7 times of the number of girls.During 2015,the number of boys how much more than number of girls?

Answer 1

$160 \div 2 = 80 \\ 80 + 20 = 100 \\ 80 - 20 = 60$