The least common denominator is one, since all of these numbers are actually whole numbers. They're actually all

If you mean the greatest common factor, then it's obviously
She has extra because she only wants to make 80oz and it takes 8 and she has 30 so 30 is extra
Answer:
-8-7= 15
so the answer is 15
Step-by-step explanation:
I think it's the Multiplication Property of Equality.
Hope this helps you! :)