Let's say there are 10 students in Pharo Primary School. If half of them are girls, then there are 5 girls.
3/5 of the girls are studying in lower classes, which means:
3/5 x 5 girls = 3 girls
So, there are 3 girls studying in lower classes.
The fraction of girls studying in lower classes is:
3 girls / 5 girls = 3/5
Therefore, the fraction of girls studying in lower classes is 3/5.