The ratios of teachers : male students : female students in a school are 2 : 17 : 18.

Question

The total number of students is 665.

Find the number of teachers.

Answer 1

Let the common ratio factor be x.

Therefore, the number of teachers = 2x
Number of male students = 17x
Number of female students = 18x

The total number of students is given to be 665.
Therefore,

2x + 17x + 18x = 665
37x = 665
x = 665 / 37
x = 17

Therefore, the number of teachers = 2x = 2 * 17 = 34 teachers.