Lee washes the outsides of houses. it takes him 40 minutes to power wash a one-story home, and he uses 180 gallons of water. power washing a two-story home takes less than 90 minutes, and he uses a maximum of 5,000 gallons of water per week. lee works no more than 40 hours each week, and his truck holds 500 gallons of water. he charges $90 to wash a one-story home and $150 to wash a two-story home. lee wants to maximize his weekly washing income washing houses. let x represent the number of one-story houses and y represent the number of two-story houses.
what are the constraints for the problem?