A can complete a project in 20 days and B can complete the same project in 30 days. If A and B start working on the project together and A quits 5 days before the project is completed, in how many days will the project be completed?	Choose the correct choice from the following answers
A) 18 days
B) 27 days
C) 26.67 days
D) 15 days
E) 12 days
Let X = the number of days taken to complete the project.   The amount of work done by A is (x-10) * (1/20).   The amount of work done by B is (x) * (1/30).   (1/20)*(x-5) + (1/30)*(x) = 1   (x/20) + (x/30) - (5/20) = 1   5x/60 = 5/4   x = 60/4= 
<gadget id="calculator">60/4</gadget>
<output>15</output>
15   Therefore, the answer is 15 days: 15.
<result>D</result>
A can complete a project in 20 days and B can complete the same project in 30 days. If A and B start working on the project together and A quits 5 days before the project is completed, in how many days will the project be completed?