Tracy can wallpaper a new house in 15 hours. together with her trainee they can wallpaper the house in 8 hours. how long would it take the trainee working by herself to do the job?

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions. to make 5 batches, jude needs to packages of pre-mixed mortar. jude uses 9 quarts of water to make batches of cement. if jude uses 16 packages of pre-mixed mortar, he will need to use quarts of water. to make 0.5 batch of cement, jude should packages of pre-mixed mortar. can you fill in the blanks