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A bicycle wheel has a diameter 0.71m. How many complete

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A bicycle wheel has a diameter 0.71m. How many complete [#permalink]

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A bicycle wheel has a diameter of 0.71m. How many complete revolutions does it make in 1km?

A. 246
B. 448
C. 1408
D. 710
E. 223
[Reveal] Spoiler: OA

Last edited by Bunuel on 07 Jan 2013, 02:10, edited 1 time in total.
Edited the question.

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Re: A bicycle wheel has a diameter 0.71m.How many complete revol [#permalink]

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New post 06 Jan 2013, 05:43
1 revolution = 3.14 * diameter.
Number of revolutions in 1km = 1000m / ( 3.14 * 0.71m ) = 448.5. Hence 448 complete revolutions.

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Re: A bicycle wheel has a diameter 0.71m. How many complete [#permalink]

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New post 06 Jul 2017, 22:59
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Re: A bicycle wheel has a diameter 0.71m. How many complete [#permalink]

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New post 06 Jul 2017, 23:23
chiccufrazer1 wrote:
A bicycle wheel has a diameter of 0.71m. How many complete revolutions does it make in 1km?

A. 246
B. 448
C. 1408
D. 710
E. 223


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A bicycle wheel has a diameter 0.71m. How many complete [#permalink]

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New post 07 Jul 2017, 16:33
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chiccufrazer1 wrote:
A bicycle wheel has a diameter of 0.71m. How many complete revolutions does it make in 1km?

A. 246
B. 448
C. 1408
D. 710
E. 223

Circumference is \(d*\pi\) = (.71m)(\(\pi\)), rounding:

\(\frac{7}{10}\)m * \(\frac{22}{7}\) = \(\frac{22}{10}\)m, or 2.2 m = circumference

1km = 1,000m, which is distance

Distance/circumference = # of revolutions

\(\frac{1,000 m}{2.2 m}\) = 454 revolutions

Answer B is the only one that's close.

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A bicycle wheel has a diameter 0.71m. How many complete   [#permalink] 07 Jul 2017, 16:33
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