Class 2 Kindness and 2 Peace had the same number of students. The ratio of the number of girls in 2 Kindness to the number of girls in 2 Peace was 1 : 9. The ratio of the number of boys in 2 Kindness to the number of boys in 2 Peace was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 2 Kindness?
- If there were 15 fewer boys than girls in Class 2 Peace, how many students were there each class?
Class 2 Kindness |
Class 2 Peace |
1x13 = 13 u |
1x13 = 13 u |
Girls |
Boys |
Girls |
Boys |
1 |
3x4 |
9 |
1x4 |
1 u |
12 u |
9 u |
4 u |
(a)
Class 2 Kindness
Boys : Girls
1 : 12
(b)
Number of fewer boys than girls in Class 2 Peace
= 9 u - 4 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Number of students in each class
= 13 u
= 13 x 3
= 39
Answer(s): (a) 1 : 12; (b) 39