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For Z = 3x + 9y, corner points (0,10), (5,5), (15,15), (0,20) are found. How many give the maximum?
AOne point
BTwo points
CThree points
DAll four points
Answer & Solution
Correct answer: B. Two points
Z is 90, 60, 180 and 180, so both (15,15) and (0,20) give the maximum 180.
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