Class 3 Love and 3 Goodness had the same number of pupils. The ratio of the number of girls in 3 Love to the number of girls in 3 Goodness was 7 : 13. The ratio of the number of boys in 3 Love to the number of boys in 3 Goodness was 4 : 1.
- What is the ratio of the number of boys to the number of girls in Class 3 Love?
- If there were 33 fewer boys than girls in Class 3 Goodness, how many pupils were there each class?
Class 3 Love |
Class 3 Goodness |
1x15 = 15 u |
1x15 = 15 u |
Girls |
Boys |
Girls |
Boys |
7 |
4x2 |
13 |
1x2 |
7 u |
8 u |
13 u |
2 u |
(a)
Class 3 Love
Boys : Girls
7 : 8
(b)
Number of fewer boys than girls in Class 3 Goodness
= 13 u - 2 u
= 11 u
11 u = 33
1 u = 33 ÷ 11 = 3
Number of pupils in each class
= 15 u
= 15 x 3
= 45
Answer(s): (a) 7 : 8; (b) 45