There were an equal number of girls in Class 2A and Class 2B.
23 of the pupils in Class 2A are girls and
37 of the pupils in Class 2B are boys. Given that there are a total of 15 boys in the two classes, how many pupils are there in Class 2B?
Class 2A |
Class 2B |
Girls |
Boys |
Girls |
Boys |
2x2 |
1x2 |
4 |
3 |
4 u |
2 u |
4 u |
3 u |
Fraction of girls in Class 2B
= 1 -
37=
47The number of girls in Class 2A and Class 2B is the same. Make the numerators the same.
2x23x2 of pupils in Class 2A =
47 of pupils in Class 2B
46 of pupils in Class 2A =
47 of pupils in Class 2B
Total number of boys
= 2 u + 3 u
= 5 u
5 u = 15
1 u = 15 ÷ 5 = 3
Number of pupils in Class 2B
= 7 u
= 7 x 3
= 21
Answer(s): 21