There were an equal number of boys in Class 6R and Class 6S.
23 of the pupils in Class 6R are boys and
19 of the pupils in Class 6S are girls. Given that there are a total of 20 girls in the two classes, how many pupils are there in Class 6S?
Class 6R |
Class 6S |
Boys |
Girls |
Boys |
Girls |
2x4 |
1x4 |
8 |
1 |
8 u |
4 u |
8 u |
1 u |
Fraction of boys in Class 6S
= 1 -
19=
89The number of boys in Class 6R and Class 6S is the same. Make the numerators the same.
2x43x4 of pupils in Class 6R =
89 of pupils in Class 6S
812 of pupils in Class 6R =
89 of pupils in Class 6S
Total number of girls
= 4 u + 1 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of pupils in Class 6S
= 9 u
= 9 x 4
= 36
Answer(s): 36