Question : The average of 30 numbers is 40 and that of the other 40 numbers is 30. The average of all the numbers is:
Option 1: $34\frac{2}{7}$
Option 2: $35$
Option 3: $34$
Option 4: $34.5$

Question

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

Option 1: $34\frac{2}{7}$

Option 2: $35$

Option 3: $34$

Option 4: $34.5$

Team Careers360 · Accepted Answer

Correct Answer: $34\frac{2}{7}$

Solution : The sum of 30 numbers = 30 × 40 = 1200
The sum of 40 numbers = 30 × 40 = 1200
An average of 70 numbers is
$=\frac{1200+1200}{30+40}=\frac{2400}{70}=34\frac{2}{7}$
Hence, the correct answer is $34\frac{2}{7}$.

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Question : The average of 30 numbers is 40 and that of the other 40 numbers is 30. The average of all the numbers is:Option 1: 3427Option 2: 35Option 3: 34Option 4: 34.5

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Question : The average of 30 numbers is 40 and that of the other 40 numbers is 30. The average of all the numbers is:
Option 1: $34 \frac{2}{7}$
Option 2: $35$
Option 3: $34$
Option 4: $34.5$