Question
Asked Nov 11, 2019
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A roofer requires 9 h to shingle a roof. After the roofer and an apprentice work on a roof for 6 h, the roofer moves on to another job. The apprentice requires 12 more hours to finish the job. How long would it take the apprentice, working alone, to do the job?
h

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Expert Answer

Step 1

Step 2

Step 3

...
12
- 1-
6
х
12
=1
9
6 6
х
12 6 3
х
12 6 1
x- 54
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12 - 1- 6 х 12 =1 9 6 6 х 12 6 3 х 12 6 1 x- 54

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