Solve the linear programming problem.Joe has to take a test which consists of short-answer questions worth 6 points each and essay questions worth 30 points each. He must do at least 9 short-answer questions, but won't have time to do more than 9. He has to answer at least 3 essay questions but can't spend time to do more than 9. If no more than 20 questions can be done, what is his maximum score?
A. 360
B. 240
C. 336
D. 480
Answer: C
Mathematics
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