Class 4 Love and 4 Peace had the same number of pupils. The ratio of the number of girls in 4 Love to the number of girls in 4 Peace was 5 : 9. The ratio of the number of boys in 4 Love to the number of boys in 4 Peace was 2 : 1.
- What is the ratio of the number of boys to the number of girls in Class 4 Love?
- If there were 20 fewer boys than girls in Class 4 Peace, how many pupils were there each class?
Class 4 Love |
Class 4 Peace |
1x13 = 13 u |
1x13 = 13 u |
Girls |
Boys |
Girls |
Boys |
5 |
2x4 |
9 |
1x4 |
5 u |
8 u |
9 u |
4 u |
(a)
Class 4 Love
Boys : Girls
5 : 8
(b)
Number of fewer boys than girls in Class 4 Peace
= 9 u - 4 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of pupils in each class
= 13 u
= 13 x 4
= 52
Answer(s): (a) 5 : 8; (b) 52