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