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?
t-w= 20
o
t=w - 70
t + w= 70
O
w=t+ 20
t-w= 20
O
w= t - 70
t + w= 70
t = W + 20