There were an equal number of girls in Class 1J and Class 1K.
23 of the students in Class 1J are girls and
17 of the students in Class 1K are boys. Given that there are a total of 12 boys in the two classes, how many students are there in Class 1K?
Class 1J |
Class 1K |
Girls |
Boys |
Girls |
Boys |
2x3 |
1x3 |
6 |
1 |
6 u |
3 u |
6 u |
1 u |
Fraction of girls in Class 1K
= 1 -
17=
67The number of girls in Class 1J and Class 1K is the same. Make the numerators the same.
2x33x3 of students in Class 1J =
67 of students in Class 1K
69 of students in Class 1J =
67 of students in Class 1K
Total number of boys
= 3 u + 1 u
= 4 u
4 u = 12
1 u = 12 ÷ 4 = 3
Number of students in Class 1K
= 7 u
= 7 x 3
= 21
Answer(s): 21