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Mean

The average o...

Question

The average of 30 results is 20 and the average of other 20 results is 30. What is the average of all the results?

A

24

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B

48

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C

25

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D

50

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Solution

The correct option is A 24
Required average $= \frac{20 \times 30 + 20 \times 30}{30 + 20}$
$= \frac{600 + 600}{50} = 24$

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