Solve the problem.
-Tracy can wallpaper 5 rooms in a new house in 15 hours. Together with her trainee they can wallpaper the 5 rooms in 11 hours. How long would it take the trainee working by herself to do the job?
A)35 hr
B)50 hr
C)70 hr
D)15 hr

Question

Quizplus · Accepted Answer

Tracy can wallpaper 5 rooms in 15 hours, so she can wallpaper 1 room in 3 hours. Together with her trainee they can wallpaper the 5 rooms in 11 hours, so they can wallpaper 1 room in 11/5 hours. The trainee can wallpaper 1 room in (11/5) - 3 = 2/5 hours. So, the trainee can wallpaper 5 rooms in 5 * (2/5) = 2 hours.

Solve the Problem. -Tracy Can Wallpaper 5 Rooms in a New House in New