There are a total of 225 pupils in secondary one. if the number of pupils who pay their school fees through giro scheme is 14 times the number of pupils who do not, find the number of pupils who did not join the scheme.

There are several information's already given in the question. Lat us first write them down and then go for solving the problem.

Total number of pupil in Secondary one = 225
Let us assume the number of pupil who do not pay the school fees through GIRO scheme = x
Then
Number of pupil who pay the school fees through GIRO scheme = 14x
So
x + 14x = 225
15x = 225
x = 15
From the above deduction, it can be concluded that 15 pupil did not join the scheme.