Bunuel wrote:

At a private school, the student to teacher ratio is 6 to 1. If the number of teachers were to increase by 50%, while the number of students remains the same, what would be the new student to teacher ratio?

A. 3:1

B. 4:1

C. 5:1

D. 9:1

E. Cannot be determined

student : teacher

6 : 1

let's assume total no. of student and teacher= 14 ( As we have ratio 6+1=7, total will be the multiple of 7. )

student=12

teacher=2

now , it's given in the question that no. of teachers were to increase by 50%.

now , we have only 2 teachers. 50% of 2 is 1.

so, new no. will be 3.

so new ratio= 12/3=4:1 Note: there were no change in student's no.

So, the correct answer will be B.