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# How many feet of solid copper wire with circular cross

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Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State
How many feet of solid copper wire with circular cross [#permalink]

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03 Aug 2003, 10:35
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How many feet of solid copper wire with circular cross sections .008 foot in diameter can be made from 1 cubic foot of copper?

Do we start Is foot and feet the same?
Does area or circumference play a role?

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Ride em cowboy

Last edited by Curly05 on 03 Aug 2003, 11:56, edited 1 time in total.
SVP
Joined: 03 Feb 2003
Posts: 1604

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03 Aug 2003, 11:03
X is lenght of wire that is a cilinder

Volume=pi*0.0016*X=1
X=1/pi*0.0016=approx=1/0.005=1000/5=200 feet
Eternal Intern
Joined: 07 Jun 2003
Posts: 467
Location: Lone Star State

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03 Aug 2003, 11:56
This is hard.

Actually you got my solution, except you picked up the cue of volume.

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Ride em cowboy

Director
Joined: 03 Jul 2003
Posts: 652

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03 Aug 2003, 16:12
X is lenght of wire that is a cilinder

Volume=pi*(0.004)^2*X=1
X=1/pi*0.004*0.004= 62500/pi feet.

I guess, Saylor fell in the trap of faction multiplication.
Otherwise, His/Her approach is correct. I have also
fallen into similar kinds of traps before. Hope I won't fall
during my real GMAT.
SVP
Joined: 03 Feb 2003
Posts: 1604

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03 Aug 2003, 22:31
stolyar wrote:
X is lenght of wire that is a cilinder

Volume=pi*0.0016*X=1
X=1/pi*0.0016=approx=1/0.005=1000/5=200 feet

I missed a zero
its diameter is 0.008; its radius 0.004; squared = 0.000016
1/0.000016*pi=1/0.00005=100000/5=20000 feet
03 Aug 2003, 22:31
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