Class 3 Kindness and 3 Joy had the same number of students. The ratio of the number of girls in 3 Kindness to the number of girls in 3 Joy was 1 : 9. The ratio of the number of boys in 3 Kindness to the number of boys in 3 Joy was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 3 Kindness?
- If there were 10 fewer boys than girls in Class 3 Joy, how many students were there each class?
Class 3 Kindness |
Class 3 Joy |
1x13 = 13 u |
1x13 = 13 u |
Girls |
Boys |
Girls |
Boys |
1 |
3x4 |
9 |
1x4 |
1 u |
12 u |
9 u |
4 u |
(a)
Class 3 Kindness
Boys : Girls
1 : 12
(b)
Number of fewer boys than girls in Class 3 Joy
= 9 u - 4 u
= 5 u
5 u = 10
1 u = 10 ÷ 5 = 2
Number of students in each class
= 13 u
= 13 x 2
= 26
Answer(s): (a) 1 : 12; (b) 26