4,950 If you pair up 1+99, 2+98, 3+97 and so on up to 49+51, you will have 49 pairs each adding to 100, and the number 50 which hasn't been included.
49x100 + 50 = 4950
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Well, darling, the sum of the first 99 odd numbers is 9801. You see, you take the last odd number, which is 197, multiply it by the total number of odd numbers (which is 99), and divide by 2. Voila! Math magic at its finest.
100
The numbers must average 33, so the answer is 32, 33 and 34.
9 and 9018 and 8127 and 7236 and 6345 and 54
The mean of any set of numbers is the sum of those numbers divided by how many numbers there are. Here, the sum is 99+97+91+89+81+76=533. When you divide 533 by 6 (the total number of numbers), you get 88.83333... repeating forever. In mixed number form, this is 88 and 5/6.