Tracy can wallpaper 7 rooms in a new house in 21 hours. together with her trainee they can wallpaper the 7 rooms in 12 hours. how long would it take the trainee working by herself to do the job? round to the nearest tenth.

Question

Mathematics

Fiesta

8 February, 20:50

Tracy can wallpaper 7 rooms in a new house in 21 hours. together with her trainee they can wallpaper the 7 rooms in 12 hours. how long would it take the trainee working by herself to do the job? round to the nearest tenth.

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Answers (1)

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Jorden Whitehead · Answer 1

The first thing we must do for this case is to define a variable.

We have then:

x: time it takes the trainee to do the work alone.

For this case we have the following equation:

7/21 + 7 / x = 7/12

Solving for x we have:

x = 28 hours

Answer:

it would take the trainee working by herself а bout:

x = 28 hours