Class 2 Joy and 2 Peace had the same number of children. The ratio of the number of girls in 2 Joy to the number of girls in 2 Peace was 3 : 7. The ratio of the number of boys in 2 Joy to the number of boys in 2 Peace was 2 : 1.
- What is the ratio of the number of boys to the number of girls in Class 2 Joy?
- If there were 15 fewer boys than girls in Class 2 Peace, how many children were there each class?
Class 2 Joy |
Class 2 Peace |
1x11 = 11 u |
1x11 = 11 u |
Girls |
Boys |
Girls |
Boys |
3 |
2x4 |
7 |
1x4 |
3 u |
8 u |
7 u |
4 u |
(a)
Class 2 Joy
Boys : Girls
3 : 8
(b)
Number of fewer boys than girls in Class 2 Peace
= 7 u - 4 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of children in each class
= 11 u
= 11 x 5
= 55
Answer(s): (a) 3 : 8; (b) 55