Derrick is building a treehouse for his younger brother. The treehouse will take 85 1/4 hours to complete. Derrick spends 17 1/20 hours on it each weekend. If he has already worked on it for 3 weeks, how many more weeks will he need to work on it until it is complete?
Please provide a step by step answer if you can :'(

2 more weeks

Step-by-step explanation:

First, determine how many weekends will be required for Derrick to complete the treehouse:

 85 1/4 hours total       85.25 hrs

= = 5 weeks

17 1/20 hrs/wk              17.05 hrs/ wk

Derrick has already worked 3 weeks, and so he should be able to complete the treehouse in 2 more weeks (2 + 3 = 5).

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step-by-step explanation: