The number of girls in a school was 2/5 of the number of pupils in the school. There were 48 more boys than girls. After some girls
went for a camp, the number of boys in the school was 4 times the number of the remaining girls. How many girls went camping?
To start off,
the student must know that since 2/5 of the pupils are girls, 3/5 must be boys.
1 - 2/5 = 3/5
We change the fraction to 2 units for girls, and 3 units for boys.
1 unit ---> 48
3 units ---> 48 * 3 = 144 ( Boys )
2 units ---> 48 * 2 = 96 ( Girls)
After, some girls went for a camp, the student must know that the number of boys remained unchanged.
Since the boys now become 4 times the number of girls,
144 / 4 = 38 ( girls now)
96 - 38 = 58 ( girls that went camping )
