There were an equal number of boys in Class 2B and Class 2C.
23 of the pupils in Class 2B are boys and
15 of the pupils in Class 2C are girls. Given that there are a total of 15 girls in the two classes, how many pupils are there in Class 2C?
| Class 2B |
Class 2C |
| Boys |
Girls |
Boys |
Girls |
| 2x2 |
1x2 |
4 |
1 |
| 4 u |
2 u |
4 u |
1 u |
Fraction of boys in Class 2C
= 1 -
15=
45The number of boys in Class 2B and Class 2C is the same. Make the numerators the same.
2x23x2 of pupils in Class 2B =
45 of pupils in Class 2C
46 of pupils in Class 2B =
45 of pupils in Class 2C
Total number of girls
= 2 u + 1 u
= 3 u
3 u = 15
1 u = 15 ÷ 3 = 5
Number of pupils in Class 2C
= 5 u
= 5 x 5
= 25
Answer(s): 25
