Hi I would appreciate if you could help me with this question that appeared in Nanyang 2015 P5 Maths exam.
A group of pupils from School A, School B and School C collected a total of 5700kg of old newspapers. Each pupil from School A collected 12kg. Each pupil from School B collected 15kg. Each pupil from School C collected 16kg. Given that 1/5 of these pupils were from School A, 1/4 of the remaining pupils were from School B and the rest were from School C, how many pupils were from School C?
Source: Nanyang Primary