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mb9252
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Joined: 11 Nov 2014
Last visit: 02 Jul 2015
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GMAT Date: 01-15-2015
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quant question 18 Nov 2014, 09:31
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Jessica bought a bicycle with a front wheel radius that is equal to the half of the rear wheel radius. if the circumference of the front wheel is 2pi and she travelled to school on her bicycle 2 miles away from her house, how many revolutions does the rear wheel make?

10/pi
50/pi
100/pi
200/pi
500/pi

The answer is 500/pi but i don't know how to go about this question.
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mikemcgarry
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quant question 18 Nov 2014, 23:24
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mb9252
Jessica bought a bicycle with a front wheel radius that is equal to the half of the rear wheel radius. if the circumference of the front wheel is 2pi and she traveled to school on her bicycle 2 miles away from her house, how many revolutions does the rear wheel make?

10/pi
50/pi
100/pi
200/pi
500/pi

The answer is 500/pi but i don't know how to go about this question.
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Dear mb9252,
My friend, something is wrong with the question you posted here. The circumference doesn't have units --- c = 2 pi, but 2 pi what? feet? meters? Without a unit here, the distance of 2 miles can't be used. I believe you copied something incorrectly. Also, I suspect that the question will come up to the nice round numbers listed in the answer choices if the distance is measure in miles. Are you sure it is not kilometers? Overall, there are many problems with the question, and it can't be answered at the moment. Make sure you have copied everything correctly.

Mike :-)