Yael worked out at a gym for 2 hours. her workut consisted of stretching for 21 minutes, jogging for 45 minutes, and lifting weights for the remaining amount of time. what percentage of yaels workout was spent lifting weights

There are 60 minutes in one hour. So to find out how many minutes there are in 2 hours just do 2x60=120. After you find that out do 120-21-45 = 54. Now we know how many minutes he worked out for. So now we do (54:120) x100=45. The percentage of Yaels workout is 45%