Class 2 Goodness and 2 Peace had the same number of children. The ratio of the number of girls in 2 Goodness to the number of girls in 2 Peace was 1 : 7. The ratio of the number of boys in 2 Goodness to the number of boys in 2 Peace was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 2 Goodness?
- If there were 20 fewer boys than girls in Class 2 Peace, how many children were there each class?
Class 2 Goodness |
Class 2 Peace |
1x10 = 10 u |
1x10 = 10 u |
Girls |
Boys |
Girls |
Boys |
1 |
3x3 |
7 |
1x3 |
1 u |
9 u |
7 u |
3 u |
(a)
Class 2 Goodness
Boys : Girls
1 : 9
(b)
Number of fewer boys than girls in Class 2 Peace
= 7 u - 3 u
= 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Number of children in each class
= 10 u
= 10 x 5
= 50
Answer(s): (a) 1 : 9; (b) 50