# The average of 30 numbers is 40 and that of other…

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

1. A. $$34\frac{2}{7}$$
2. B. 35
3. C. 34
4. D. 34.5

Answer: Option A

Here is complete explanation of The average of 30 numbers is 40 and that of other….

### Solution(By ExamCraze Team)

According to the question,
Average of 30 numbers is = 40
Sum of 30 numbers is = 40 × 30 = 1200
Average of 40 numbers is = 30
Sum of 40 numbers is = 40 × 30 = 1200
Total average = $$frac{1200 + 1200}{70}$$
= $$frac{2400}{70}$$
= $$34frac{2}{7}$$