Class 2 Peace and 2 Joy had the same number of pupils. The ratio of the number of girls in 2 Peace to the number of girls in 2 Joy was 7 : 10. The ratio of the number of boys in 2 Peace to the number of boys in 2 Joy was 2 : 1.
- What is the ratio of the number of boys to the number of girls in Class 2 Peace?
- If there were 14 fewer boys than girls in Class 2 Joy, how many pupils were there each class?
Class 2 Peace |
Class 2 Joy |
1x13 = 13 u |
1x13 = 13 u |
Girls |
Boys |
Girls |
Boys |
7 |
2x3 |
10 |
1x3 |
7 u |
6 u |
10 u |
3 u |
(a)
Class 2 Peace
Boys : Girls
7 : 6
(b)
Number of fewer boys than girls in Class 2 Joy
= 10 u - 3 u
= 7 u
7 u = 14
1 u = 14 ÷ 7 = 2
Number of pupils in each class
= 13 u
= 13 x 2
= 26
Answer(s): (a) 7 : 6; (b) 26