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conversion inches to kilometers

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Manager
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Status: GMAT Preperation
Joined: 04 Feb 2010
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Concentration: Social Entrepreneurship, Social Entrepreneurship
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WE: Consulting (Insurance)
conversion inches to kilometers [#permalink]

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New post 28 Oct 2010, 00:47
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the average distance between the sun and a certain planet is approximatly 2.3 10^14 inches. which of the following is the closest to the average distence between sun and the planet in kelometers? (1 km is approx 3.9 x 10^4 inches)
7.1 x 10^8
5.9 x 10^9
1.6 x 10^10
1.6 x 10^11
5.9 x 10^11
[Reveal] Spoiler: OA
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Joined: 08 Sep 2010
Posts: 226
Location: India
WE 1: 6 Year, Telecom(GSM)
Re: conversion inches to kilometers [#permalink]

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New post 28 Oct 2010, 01:05
vanidhar wrote:
the average distance between the sun and a certain planet is approximatly 2.3 10^14 inches. which of the following is the closest to the average distence between sun and the planet in kelometers? (1 km is approx 3.9 x 10^4 inches)
7.1 x 10^8
5.9 x 10^9
1.6 x 10^10
1.6 x 10^11
5.9 x 10^11



3.9 x 10^4 inches corresponds to 1 km
Hence 2.3 * 10^14 inches corresponds to {1/(3.9 x 10^4)}*(2.3 * 10^14 ) = 5.9 x 10^9 (approx)

Answer is B.
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Re: conversion inches to kilometers [#permalink]

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New post 09 Nov 2010, 08:24
No need to solve entire problem.
Distance in KM = 23*(10)^14/39*(10)^4 which is -230*(10)^13/39*(10)^4 = something a.b* (10)^9

There is only 1 option with 10^9.

Ans B
Re: conversion inches to kilometers   [#permalink] 09 Nov 2010, 08:24
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conversion inches to kilometers

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