Class 3 Peace and 3 Patience had the same number of pupils. The ratio of the number of boys in 3 Peace to the number of boys in 3 Patience was 1 : 7. The ratio of the number of girls in 3 Peace to the number of girls in 3 Patience was 3 : 1.
- What is the ratio of the number of girls to the number of boys in Class 3 Peace?
- If there were 16 fewer girls than boys in Class 3 Patience, how many pupils were there each class?
Class 3 Peace |
Class 3 Patience |
1x10 = 10 u |
1x10 = 10 u |
Boys |
Girls |
Boys |
Girls |
1 |
3x3 |
7 |
1x3 |
1 u |
9 u |
7 u |
3 u |
(a)
Class 3 Peace
Girls : Boys
1 : 9
(b)
Number of fewer girls than boys in Class 3 Patience
= 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