Number Problem - Mean

[rahultso]

What is the mean of 11 consecutive integers?

1. Mean of the first 9 integers is 7.
2. Mean of the last 9 integers is 9.

Thanks.

[bkparikh]

D

Statement 1: SUFFICIENT
We know the middle integer of the first 9 is 7 (that's the only way 9 consecutive integers can have a mean of 7). From there we'll be able to figure out the mean when we add 2 more integers to the end.

Statement 2: SUFFICIENT
We know the middle integer of the last 9 is 9. Same reasoning as above. We'll be able to figure out the mean when we add 2 more integers to the beginning.

You don't actually need to solve the problem, but if you did the answer is 8.

[rahultso]

Thanks man, that's awesome!