(First + last) multiplied by half the last,
in this case 31 x 15 ie 465.
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The numbers are 9, 10 and 11 with a sum of 30.
nine, ten and eleven. Three consecutive numbers that total thirty
160
The numbers are 27, 28, 29 and 30.
The easiest way to solve this problem is to look at the sets of numbers beginning with each of the numbers given. Choice A begins with the number 24, so add the three consecutive even numbers beginning with 24, that is, 24 + 26 + 28. The sum of these numbers is 78, so the answer is choice A: 24.