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