The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is :

The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is :
[A]34
[B]34\frac{2}{7}
[C]34.5
[D]35

\mathbf{34\frac{2}{7}}
Average of all numbers =
= \frac{30\times 40 + 40\times 30}{70}
= \frac{2400}{70} = 34\frac{2}{7}
Hence option [B] is correct answer.

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