A piece of sheet metal, 20 inches wide, is bent to form the gutter shown in the illustration. If the cross-sectional area is 50 square inches, find the depth of the gutter.
?
?
A. 6 in
B. 7 in
C. 8 in
D. 5 in
Answer: D
Mathematics
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and 
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A. Does not exist B. 12 C. 2 D. 4
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