Class 3 Faithfulness and 3 Patience had the same number of pupils. The ratio of the number of girls in 3 Faithfulness to the number of girls in 3 Patience was 11 : 15. The ratio of the number of boys in 3 Faithfulness to the number of boys in 3 Patience was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 3 Faithfulness?
- If there were 39 fewer boys than girls in Class 3 Patience, how many pupils were there each class?
Class 3 Faithfulness |
Class 3 Patience |
1x17 = 17 u |
1x17 = 17 u |
Girls |
Boys |
Girls |
Boys |
11 |
3x2 |
15 |
1x2 |
11 u |
6 u |
15 u |
2 u |
(a)
Class 3 Faithfulness
Boys : Girls
11 : 6
(b)
Number of fewer boys than girls in Class 3 Patience
= 15 u - 2 u
= 13 u
13 u = 39
1 u = 39 ÷ 13 = 3
Number of pupils in each class
= 17 u
= 17 x 3
= 51
Answer(s): (a) 11 : 6; (b) 51