There are 80 boys and girls altogether.
45 of the number of boys is 10 more than the number of girls.
- How many boys are there?
- How many more boys than girls are there?
(a)
Number of boys = 5 u
Number of girls = 4 u - 10
Number of children
= 5 u + 4 u - 10
= 9 u - 10
9 u - 10 = 80
9 u = 80 + 10
9 u = 90
1 u = 90 ÷ 9 = 10
Number of boys
= 5 u
= 5 x 10
= 50
(b)
Number of girls
= 80 - 50
= 30
Number of more boys than girls
= 50 - 30
= 20
Answer(s): (a) 50; (b) 20