Class 1 Joy and 1 Peace had the same number of pupils. The ratio of the number of boys in 1 Joy to the number of boys in 1 Peace was 7 : 9. The ratio of the number of girls in 1 Joy to the number of girls in 1 Peace was 2 : 1.
- What is the ratio of the number of girls to the number of boys in Class 1 Joy?
- If there were 28 fewer girls than boys in Class 1 Peace, how many pupils were there each class?
Class 1 Joy |
Class 1 Peace |
1x11 = 11 u |
1x11 = 11 u |
Boys |
Girls |
Boys |
Girls |
7 |
2x2 |
9 |
1x2 |
7 u |
4 u |
9 u |
2 u |
(a)
Class 1 Joy
Girls : Boys
7 : 4
(b)
Number of fewer girls than boys in Class 1 Peace
= 9 u - 2 u
= 7 u
7 u = 28
1 u = 28 ÷ 7 = 4
Number of pupils in each class
= 11 u
= 11 x 4
= 44
Answer(s): (a) 7 : 4; (b) 44