Class 3 Peace and 3 Goodness had the same number of pupils. The ratio of the number of girls in 3 Peace to the number of girls in 3 Goodness was 11 : 13. The ratio of the number of boys in 3 Peace to the number of boys in 3 Goodness was 2 : 1.
- What is the ratio of the number of boys to the number of girls in Class 3 Peace?
- If there were 22 fewer boys than girls in Class 3 Goodness, how many pupils were there each class?
Class 3 Peace |
Class 3 Goodness |
1x15 = 15 u |
1x15 = 15 u |
Girls |
Boys |
Girls |
Boys |
11 |
2x2 |
13 |
1x2 |
11 u |
4 u |
13 u |
2 u |
(a)
Class 3 Peace
Boys : Girls
11 : 4
(b)
Number of fewer boys than girls in Class 3 Goodness
= 13 u - 2 u
= 11 u
11 u = 22
1 u = 22 ÷ 11 = 2
Number of pupils in each class
= 15 u
= 15 x 2
= 30
Answer(s): (a) 11 : 4; (b) 30