Class 5 Peace and 5 Kindness had the same number of pupils. The ratio of the number of girls in 5 Peace to the number of girls in 5 Kindness was 7 : 15. The ratio of the number of boys in 5 Peace to the number of boys in 5 Kindness was 5 : 1.
- What is the ratio of the number of boys to the number of girls in Class 5 Peace?
- If there were 26 fewer boys than girls in Class 5 Kindness, how many pupils were there each class?
Class 5 Peace |
Class 5 Kindness |
1x17 = 17 u |
1x17 = 17 u |
Girls |
Boys |
Girls |
Boys |
7 |
5x2 |
15 |
1x2 |
7 u |
10 u |
15 u |
2 u |
(a)
Class 5 Peace
Boys : Girls
7 : 10
(b)
Number of fewer boys than girls in Class 5 Kindness
= 15 u - 2 u
= 13 u
13 u = 26
1 u = 26 ÷ 13 = 2
Number of pupils in each class
= 17 u
= 17 x 2
= 34
Answer(s): (a) 7 : 10; (b) 34