Class 5 Peace and 5 Joy had the same number of children. The ratio of the number of boys in 5 Peace to the number of boys in 5 Joy was 3 : 7. The ratio of the number of girls in 5 Peace to the number of girls in 5 Joy was 2 : 1.
- What is the ratio of the number of girls to the number of boys in Class 5 Peace?
- If there were 9 fewer girls than boys in Class 5 Joy, how many children were there each class?
Class 5 Peace |
Class 5 Joy |
1x11 = 11 u |
1x11 = 11 u |
Boys |
Girls |
Boys |
Girls |
3 |
2x4 |
7 |
1x4 |
3 u |
8 u |
7 u |
4 u |
(a)
Class 5 Peace
Girls : Boys
3 : 8
(b)
Number of fewer girls than boys in Class 5 Joy
= 7 u - 4 u
= 3 u
3 u = 9
1 u = 9 ÷ 3 = 3
Number of children in each class
= 11 u
= 11 x 3
= 33
Answer(s): (a) 3 : 8; (b) 33