Answer:
Step-by-step explanation:
basicallyi you want to find a common denominator before you add them up. the common denominator in this case would be 20, since it's the first common multiple all of them share
50/20 plus 72/20 plus 55/20
177/20 would be your answer
6,12,18,24,30,36,42,48,54
Sally has $40 hope it helps some
Use photomath ! It's an app that gives you the answer with the explanation and it shows you how it got to the answer !