i found c
but how do you put this one into equation
i picked number 31 be the total number of student and teacher
hence 30 Students and 1 teacher
so 60 STUDENTS
AND 1+5 Teacher
right ? THANKS
The present ratio of students to teachers at a certain school is 30 to 1. If the student enrollment were to increase by 50 students and the number of teachers were to increase by 5, the ratio of students to teachers would then be 25 to 1. What is the present number of teachers ?
Let the no. of teachers be x.
Then the no. of students are 30x.( use this fool proof technique for ratois).
Then after 50 students join , the total no. of students = 30x + 50
after 5 teachers join, their no would be = x + 5.
But the ratio now is 25/1.
ie (30x + 50)/(x + 5) = 25.
Solve for x to get to the answer.