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Select the correct answer. Heather spent a total of 70 minutes working out at the gym. She spent 20 minutes longer running on the treadmill than she spent lifting weights. When t represents the time Heather spent running on the treadmill and w represents the time she spent lifting weights, which system of equations represents this situation? Oa t+w = 70 w = + 20 Op t-w = 20 = w+ 70 Je t+w = 70 t = w+ 20 Op t-w = 20 w = + 70