There were an equal number of girls in Class 4C and Class 4D.
23 of the pupils in Class 4C are girls and
37 of the pupils in Class 4D are boys. Given that there are a total of 20 boys in the two classes, how many pupils are there in Class 4D?
| Class 4C |
Class 4D |
| Girls |
Boys |
Girls |
Boys |
| 2x2 |
1x2 |
4 |
3 |
| 4 u |
2 u |
4 u |
3 u |
Fraction of girls in Class 4D
= 1 -
37=
47The number of girls in Class 4C and Class 4D is the same. Make the numerators the same.
2x23x2 of pupils in Class 4C =
47 of pupils in Class 4D
46 of pupils in Class 4C =
47 of pupils in Class 4D
Total number of boys
= 2 u + 3 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of pupils in Class 4D
= 7 u
= 7 x 4
= 28
Answer(s): 28
