Question 571976
The sum of 4 consecutive odd number is 80

Let X be the first of these numbers
Then the next odd number is X+2 
The third is X+4
The fourth is X+6


All of these add up to 80
(X) + (X+2) + (X+4) + (X+6) = 80


Using the commutative and associative laws, let's transform this equation into
(X + X + X + X) + (2 + 4 + 6) = 80
4X + 12 = 80


Subtract 12 from both sides of the equation gives
4X = 68


Divide both sides by 4 gives
X = 17


Going back to the original question:
What are the 4 consecutive odd numbers:  17, 19, 21, 23


Checking our answer:
17 + 19 + 21 + 23 = 80  Correct!