Question

If the number of boys in a class is 6 times the number of girls, which value can never be the total number of students?

Answer 1

Let the number of girls in a class is x and the number of boys in the class is 6x.

So total number of students in the class is x + 6x = 7x

The values which can never be the total number of student is other then the multiple of 7.