Class 6 Peace and 6 Gentleness had the same number of children. The ratio of the number of girls in 6 Peace to the number of girls in 6 Gentleness was 5 : 7. The ratio of the number of boys in 6 Peace to the number of boys in 6 Gentleness was 2 : 1.
- What is the ratio of the number of boys to the number of girls in Class 6 Peace?
- If there were 15 fewer boys than girls in Class 6 Gentleness, how many children were there each class?
Class 6 Peace |
Class 6 Gentleness |
1x9 = 9 u |
1x9 = 9 u |
Girls |
Boys |
Girls |
Boys |
5 |
2x2 |
7 |
1x2 |
5 u |
4 u |
7 u |
2 u |
(a)
Class 6 Peace
Boys : Girls
5 : 4
(b)
Number of fewer boys than girls in Class 6 Gentleness
= 7 u - 2 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Number of children in each class
= 9 u
= 9 x 3
= 27
Answer(s): (a) 5 : 4; (b) 27