There were an equal number of girls in Class 6M and Class 6N.
23 of the pupils in Class 6M are girls and
15 of the pupils in Class 6N are boys. Given that there are a total of 12 boys in the two classes, how many pupils are there in Class 6N?
| Class 6M |
Class 6N |
| Girls |
Boys |
Girls |
Boys |
| 2x2 |
1x2 |
4 |
1 |
| 4 u |
2 u |
4 u |
1 u |
Fraction of girls in Class 6N
= 1 -
15=
45The number of girls in Class 6M and Class 6N is the same. Make the numerators the same.
2x23x2 of pupils in Class 6M =
45 of pupils in Class 6N
46 of pupils in Class 6M =
45 of pupils in Class 6N
Total number of boys
= 2 u + 1 u
= 3 u
3 u = 12
1 u = 12 ÷ 3 = 4
Number of pupils in Class 6N
= 5 u
= 5 x 4
= 20
Answer(s): 20
