Class 1 Kindness and 1 Patience had the same number of children. The ratio of the number of girls in 1 Kindness to the number of girls in 1 Patience was 7 : 15. The ratio of the number of boys in 1 Kindness to the number of boys in 1 Patience was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 1 Kindness?
- If there were 22 fewer boys than girls in Class 1 Patience, how many children were there each class?
Class 1 Kindness |
Class 1 Patience |
1x19 = 19 u |
1x19 = 19 u |
Girls |
Boys |
Girls |
Boys |
7 |
3x4 |
15 |
1x4 |
7 u |
12 u |
15 u |
4 u |
(a)
Class 1 Kindness
Boys : Girls
7 : 12
(b)
Number of fewer boys than girls in Class 1 Patience
= 15 u - 4 u
= 11 u
11 u = 22
1 u = 22 ÷ 11 = 2
Number of children in each class
= 19 u
= 19 x 2
= 38
Answer(s): (a) 7 : 12; (b) 38