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On mixing two classes A and B of student...

On mixing two classes A and B of students having average marks 25 and 40 respectively, the overall average obtained is 30. Find the ratio of the students in the classes A and B.

A

`2 : 1`

B

`5 :8`

C

`5 : 6`

D

`3 : 4`

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The correct Answer is:
A
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KIRAN PUBLICATION-RATIO AND PROPORTION -TYPE-III
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