What is the answer to this question?

(99*82 + 99)/(99+1) = 82.17

Mean is calculated by finding total score divided by number of people. 
Total score is (99*82 + 99)
Number of people is (99+1)
Do the math and the answer is 82.17

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Yes. there is a constant ratio of number of calories to gram of protein.12/3=24/4=32/8=44/11=4