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The average mathematics marks of two Sec...

The average mathematics marks of two Sections A and B of Class IX in the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratio of the number of students of Section A and B is:

A

`7:8`

B

`7:5`

C

`8:7`

D

`8:5`

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The correct Answer is:
C
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