In the Mathematics department of a certain university, the student teacher ratio was 20:1. It was decided to increase the number of students and teachers by 50% and 10% respectively. The new student to teacher ratio is?
- 30:1
- 300:11
- 25:1
- None of these
Explanation
Old ratio = 20 : 1
Let students = 20, teachers = 1
New students = 20 + 50% of 20 = 20 _ 1.5 = 30
New teachers = 1 + 10% of 1 = 1 _ 1.1 = 1.1
New ratio = 30 : 1.1 = 30 / 1.1
Multiply by 10 to remove decimal = 300 / 11 = 300:11
Last verified on 20-10-2026
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