Class 3 Faithfulness and 3 Love had the same number of students. The ratio of the number of girls in 3 Faithfulness to the number of girls in 3 Love was 7 : 13. The ratio of the number of boys in 3 Faithfulness to the number of boys in 3 Love was 3 : 1.
- What is the ratio of the number of boys to the number of girls in Class 3 Faithfulness?
- If there were 30 fewer boys than girls in Class 3 Love, how many students were there each class?
Class 3 Faithfulness |
Class 3 Love |
1x16 = 16 u |
1x16 = 16 u |
Girls |
Boys |
Girls |
Boys |
7 |
3x3 |
13 |
1x3 |
7 u |
9 u |
13 u |
3 u |
(a)
Class 3 Faithfulness
Boys : Girls
7 : 9
(b)
Number of fewer boys than girls in Class 3 Love
= 13 u - 3 u
= 10 u
10 u = 30
1 u = 30 ÷ 10 = 3
Number of students in each class
= 16 u
= 16 x 3
= 48
Answer(s): (a) 7 : 9; (b) 48