There are 90 boys and girls altogether.
37 of the number of boys is 20 more than the number of girls.
- How many boys are there?
- How many more boys than girls are there?
(a)
Number of boys = 7 u
Number of girls = 3 u - 20
Number of children
= 7 u + 3 u - 20
= 10 u - 20
10 u - 20 = 90
10 u = 90 + 20
10 u = 110
1 u = 110 ÷ 10 = 11
Number of boys
= 7 u
= 7 x 11
= 77
(b)
Number of girls
= 90 - 77
= 13
Number of more boys than girls
= 77 - 13
= 64
Answer(s): (a) 77; (b) 64