There were an equal number of boys in Class 1K and Class 1L.
45 of the pupils in Class 1K are boys and
19 of the pupils in Class 1L are girls. Given that there are a total of 12 girls in the two classes, how many pupils are there in Class 1L?
Class 1K |
Class 1L |
Boys |
Girls |
Boys |
Girls |
4x2 |
1x2 |
8 |
1 |
8 u |
2 u |
8 u |
1 u |
Fraction of boys in Class 1L
= 1 -
19=
89The number of boys in Class 1K and Class 1L is the same. Make the numerators the same.
4x25x2 of pupils in Class 1K =
89 of pupils in Class 1L
810 of pupils in Class 1K =
89 of pupils in Class 1L
Total number of girls
= 2 u + 1 u
= 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of pupils in Class 1L
= 9 u
= 9 x 4
= 36
Answer(s): 36