Suppose the four numbers are x, x+1, x+2 and x+3
Then their sum is 4x + 6
so that their mean is (4x+6)/4 = x + 6/4 = x+1.5
So x+1.5 = 9.5 so that x=8 and so the largest number is x+3 = 8+3 = 11.
This answer assumes that the 4 consecutive numbers are in increasing order. If they were four consecutive numbers in decreasing order, they would be x, x-1, x-2 and x-3. In this case x=11 and the fourth number would be 8.
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Consecutive integers are integers that follow in sequence. Each number is 1 more than the previous numbers.
Two consecutive numbers (pressumably integers) will always add up to an odd number, so this has no solution. If you mean "two consecutive even numbers" or "two consecutive odd numbers", you should quickly be able to find a solution by trial-and-error.
In numerical order, with no missing numbers. 1, 2, 3, and 4 are consecutive. 1, 3, 4, and 2 are the same numbers, but are not consecutive because they are not in order. 1, 3, and 4 are not consecutive because 2 is missing.
Do you mean:"What three consecutive numbers add up to 99?" If you do, then the numbers are 32, 33, 34.
If you mean two consecutive odd numbers then they are 117 and 119