Marks | number of students |
1 - 20 | 10 |
20 - 40 | 40 |
40 - 60 | 15 |
60 - 80 | 12 |
80 - 100 | 30 |
What is the ratio of the number of student between 20-40 and 80-100 marks?
A4 ∶ 3
B5 ∶ 3
C3 ∶ 5
D3 ∶ 4
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