Is my set up right? 1. If Amy, Bianca and Carrie work together on a job, it will take one and one-third hours. If only Amy and Bianca work, it would take one and five-sevenths hours, but if Bianca and Carrie work, it would take two and two-fifths hours, how long would it take each girl working alone to complete the job? This looks like three equations in three unknowns. Amy = 1/x Bianca = 1/y Carrie = 1/z 1/x + 1/y + 1/z = 4/3 1/x + 1/y = 12/7 1/y + 1/z = 12/5 Yes? 2. John can paint a garage in 8 hours. Gary can do it in 6 hours. Fred can do it in 4 hours. How long will it take if they all paint together? John = 1/8 Gary = 1/6 Fred = 1/4 1/8 + 1/6 + 1/4 = 1/x Let x = length of time it will take all three to do the job.