Q. 54.5( 36 Votes )
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Answer :
Number of teachers for 60 students = 3
Number of teachers for 400 students = X
The ratio of students = 60:400
The ratio of teachers = 3:X
The ratio of teachers = The ratio of students
60:400 = 3:X
⇒ 
⇒ 
⇒X = 20
∴ There are 20 teachers for 400 students in the school
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