The average of 5 quantities is 6. The average of 3 of them is 4. What is the average of remaining 2 numbers?
Answer: 9
Explanation
Given that the average of 5 numbers is 6, their sum is 5×6=30.
Given that the average of the 3 selected numbers is 4, their sum is 3×4=12
So the remaining two numbers add up to 30−12=18 and their average is 18/2=9
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