A set of 3 consecutive integers has a sum of 30. Which integers are they?

Since consecutive means they're one away from each other, the 3 integers can be written like this:

x

x + 1

x + 2

So, we add all of these together to find x:

x + x + 1 + x + 2 = 30

3x + 3 = 30

3x = 27

x = 9

This then means the numbers are 9, 10, and 11

You can only do it like '7.5 plus 9.5 plus 13