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# A gas pipe has an outside diameter of 24 inches. The steel wall of the

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Senior Manager
Joined: 26 Dec 2015
Posts: 275
Location: United States (CA)
Concentration: Finance, Strategy
WE: Investment Banking (Venture Capital)
A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink]

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19 Sep 2017, 10:42
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Difficulty:

25% (medium)

Question Stats:

82% (00:37) correct 18% (01:19) wrong based on 17 sessions

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A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

A) 23$$\pi$$

B) 47$$\pi$$

C) 147$$\pi$$

D) 529$$\pi$$

E) 575$$\pi$$
[Reveal] Spoiler: OA
Manager
Joined: 17 Aug 2016
Posts: 51
Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the [#permalink]

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19 Sep 2017, 11:09
LakerFan24 wrote:
A gas pipe has an outside diameter of 24 inches. The steel wall of the pipe is 1 inch thick. What is the area of the cross-section of the steel wall of the pipe?

A) 23$$\pi$$

B) 47$$\pi$$

C) 147$$\pi$$

D) 529$$\pi$$

E) 575$$\pi$$

Area of cross-section = Area of outer circle - Area of inner circle = $$pi* 12^2 - pi*11^2 = 23 pi$$

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Re: A gas pipe has an outside diameter of 24 inches. The steel wall of the   [#permalink] 19 Sep 2017, 11:09
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