Question

In a school of 2000 students, the ratio of teachers to students is 3:80.
Some teachers join the school and the ratio changes to 1:20.
Find the number of teachers who joined the school.

Answer 1

Answer:

100 Teachers

Step-by-step explanation:

2000/80=25

2000/20=100 Teachers

Answer 2

Step-by-step explanation:

Part I

No. of students=2000

Ratio of students to teachers=3:80

Let no. of teachers be 3x and students be 80x

=> 80x=2000

=> x=25

Therefore, there were 25×3 i.e. 75 teachers.

Part II

New ratio of teachers to students =1:20

Let no. of students=20y and teachers be y.

20y=2000

y=100

No of teachers after the arrival of new teachers =100

No of teachers joined=100-75=25.ans