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:
Option 2:
Option 3:
Option 4:
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Correct Answer:
Solution :
The sum of 30 numbers = 30 × 40 = 1200
The sum of 40 numbers = 30 × 40 = 1200
An average of 70 numbers is
Hence, the correct answer is
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