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11 Jan 2005, 09:22
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A wrapping paper has dimensions 1 yard by 7 yards. What is the volume in cu.ft of the largest cube that could be packed using this paper? (1 yard = 3 ft)
a) 8 B) 9 C) 18 D) 27 E) 36
I already have the OA. So please just don;t post number, show how you got it.
a) 8 B) 9 C) 18 D) 27 E) 36
I already have the OA. So please just don;t post number, show how you got it.
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11 Jan 2005, 11:31
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The largest cube would be of side 3 so voulme would be 27cu feet
The area of the paper is 3 * 27 u can get 6 3x3 out of this so total surface area 6 * 3*3 = 54
so answer D
The area of the paper is 3 * 27 u can get 6 3x3 out of this so total surface area 6 * 3*3 = 54
so answer D
11 Jan 2005, 12:31
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Total area of paper = 3*21=63
Surface area of cube=6a^2
if a=4, 6a^2= 96
if a=3, 6a^2=54 which is less than 63
thus a cube of side 3 is the largest cube which can be wrapped whose vol=3*3*3=27
Surface area of cube=6a^2
if a=4, 6a^2= 96
if a=3, 6a^2=54 which is less than 63
thus a cube of side 3 is the largest cube which can be wrapped whose vol=3*3*3=27
