Melanie saves $20 every month in her savings account. She withdrew $60 one time to go shopping. She now has $280 in her account. Which equation represents this situation?

20m/60 = 280
20m/60 = 280

20m + 60 = 280
20m + 60 = 280

20m - 60 = 280
20m - 60 = 280

20m (60) - 280