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 1 : 7. The ratio of the number of boys in 4 Love to the number of boys in 4 Peace was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 4 Love?
- If there were 16 fewer boys than girls in Class 4 Peace, how many pupils were there each class?
Class 4 Love |
Class 4 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 4 Love
Boys : Girls
1 : 9
(b)
Number of fewer boys than girls in Class 4 Peace
= 7 u - 3 u
= 4 u
4 u = 16
1 u = 16 ÷ 4 = 4
Number of pupils in each class
= 10 u
= 10 x 4
= 40
Answer(s): (a) 1 : 9; (b) 40