There were an equal number of boys in Class 5H and Class 5J.
23 of the students in Class 5H are boys and
15 of the students in Class 5J are girls. Given that there are a total of 18 girls in the two classes, how many students are there in Class 5J?
| Class 5H |
Class 5J |
| Boys |
Girls |
Boys |
Girls |
| 2x2 |
1x2 |
4 |
1 |
| 4 u |
2 u |
4 u |
1 u |
Fraction of boys in Class 5J
= 1 -
15=
45The number of boys in Class 5H and Class 5J is the same. Make the numerators the same.
2x23x2 of students in Class 5H =
45 of students in Class 5J
46 of students in Class 5H =
45 of students in Class 5J
Total number of girls
= 2 u + 1 u
= 3 u
3 u = 18
1 u = 18 ÷ 3 = 6
Number of students in Class 5J
= 5 u
= 5 x 6
= 30
Answer(s): 30
