Mandy is a master wood-carver and Jerry is her apprentice. They will each work the same number of hours making toy cars. Each car requires 4 wheels and 1 body. Mandy makes wheels at the rate of 25 per hour and bodies at the rate of 10 per hour. Jerry makes wheels at the rate of 10 per hour and bodies at the rate of 10 per hour. If they wish to maximize output, how many wheels should Jerry make per
hour.