The Grass Doctor

How many hours did Henry spend mowing lawns alone?

During the summer, Henry earned $5 per hour babysitting and $4 per hour mowing lawns. Henry babysat a total of 45 hours. He earned a total of $308 by the end of the summer by babysitting and mowing lawns. How many hours did he spend mowing lawns?

Public Comments

1. $5 x 45 = $225 $308 - $225 = 83 83 divided by 4 = 20.75 He spent 20.75 hours. I guess that's 20:45
2. 5y+4(45)=308 5y+180=308 308-180=5y 128=5y y=25.6 hours