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18 Feb 2018, 23:12
Kudos
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
54% (02:00) correct
46%
(02:25)
wrong
based on 99
sessions
History
Date
Time
Result
Not Attempted Yet
A racetrack bounded by two concentric circles, one with a diameter of 160 yards and the other with a diameter of 140 yards, is to covered with asphalt. If the asphalt layer is to be 1 foot deep, how many cubic yards of asphalt will be needed? (1 yard = 3 feer)
(A) \(75\pi\)
(B) \(90\pi\)
(C) \(500\pi\)
(D) \(1500\pi\)
(E) \(2000\pi\)
(A) \(75\pi\)
(B) \(90\pi\)
(C) \(500\pi\)
(D) \(1500\pi\)
(E) \(2000\pi\)
18 Feb 2018, 23:18
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Bunuel
Since the calculation required is straightforward, we'll just do it.
This is a Precise approach.
We need to calculate the area between the two circles and multiply it by a height of 1 foot = 1/3 yard.
This is \(\pi *80^2 - \pi*70^2 = 6400 \pi - 4900 \pi = 1500 \pi\).
(C), 1500/3 = 500 is our answer
05 Mar 2018, 06:44
Kudos
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Bunuel please edit the question if you have time. This kind of question in gmat provides always the convesion between the units feet- yards
