Justin School had 528 pupils and Asher School had 25% more pupils. When an equal number of pupils left each school, the ratio of the pupils in Asher School to that in Justin School became 2 : 1. How many pupils were there in both schools in the end?

	Justin School	Asher School	Difference
Before	528		132
Change	- ?	- ?
After	2 u	1 u	1 u

Since an equal number of pupils left each school, the difference in the number of pupils at first and in the end between the 2 schools remains the same.  Make the difference between the number of pupils in Justin School and Asher School at first and in the end the same. 

Difference between the number of pupils in both schools at first
= 25% x 528
= ²⁵₁₀₀ x 528
= 132

Difference between the number of pupils in both schools in the end
= 2 u - 1 u
= 1 u

1 u = 132

Total number of pupils in both schools in the end
= 2 u + 1 u
= 3 u
= 3 x 132
= 396

Answer(s): 396