Class 3 Faithfulness and 3 Gentleness had the same number of students. The ratio of the number of boys in 3 Faithfulness to the number of boys in 3 Gentleness was 5 : 7. The ratio of the number of girls in 3 Faithfulness to the number of girls in 3 Gentleness was 2 : 1.
- What is the ratio of the number of girls to the number of boys in Class 3 Faithfulness?
- If there were 30 fewer girls than boys in Class 3 Gentleness, how many students were there each class?
Class 3 Faithfulness |
Class 3 Gentleness |
1x9 = 9 u |
1x9 = 9 u |
Boys |
Girls |
Boys |
Girls |
5 |
2x2 |
7 |
1x2 |
5 u |
4 u |
7 u |
2 u |
(a)
Class 3 Faithfulness
Girls : Boys
5 : 4
(b)
Number of fewer girls than boys in Class 3 Gentleness
= 7 u - 2 u
= 5 u
5 u = 30
1 u = 30 ÷ 5 = 6
Number of students in each class
= 9 u
= 9 x 6
= 54
Answer(s): (a) 5 : 4; (b) 54