MSTC Refresher 12: Area of Lot with Missing Sides 

12. A surveyor forgot to indicate the area of a rectangular lot. However, he remembers that the area remains the same if the length is decreased by 12.5 m and the width is increased by 10 m or the length is decreased by 50 m and the width is increased by 50 m. What was the original area of the rectangular lot (sq.m)?
A. 30,000 C. 40,000
B. 32,000 D. 42,000
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