There were an equal number of boys in Class 2S and Class 2T.
23 of the pupils in Class 2S are boys and
17 of the pupils in Class 2T are girls. Given that there are a total of 12 girls in the two classes, how many pupils are there in Class 2T?
| Class 2S |
Class 2T |
| Boys |
Girls |
Boys |
Girls |
| 2x3 |
1x3 |
6 |
1 |
| 6 u |
3 u |
6 u |
1 u |
Fraction of boys in Class 2T
= 1 -
17=
67The number of boys in Class 2S and Class 2T is the same. Make the numerators the same.
2x33x3 of pupils in Class 2S =
67 of pupils in Class 2T
69 of pupils in Class 2S =
67 of pupils in Class 2T
Total number of girls
= 3 u + 1 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Number of pupils in Class 2T
= 7 u
= 7 x 3
= 21
Answer(s): 21
