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The number is being divided by 1.5 instead ...

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by Night reader » Tue Jan 11, 2011 4:20 am
The number is being divided by 1.5 instead of being multiplied by 5. What is the percentage of error obtained?

A. 30%
B. 40%
C. 50%
D. 60%
E. 87%
Last edited by Night reader on Tue Jan 11, 2011 6:43 am, edited 1 time in total.
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by anshumishra » Tue Jan 11, 2011 4:38 am
Night reader wrote:The number is being divided by 1.5 instead of being multiplied by 5. What is the percentage of error obtained?

A. 30%
B. 40%
C. 50%
D. 60%
E. 70%
Number = x
Error=5x-2x/3 = 13x/3

percentage = (13x/3)/5x * 100 = 1300/15 % ~= 86.67%
Probably, I made some calc. mistake or the option needs to be edited.
Thanks
Anshu

(Every mistake is a lesson learned )
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by Night reader » Tue Jan 11, 2011 6:43 am
anshumishra wrote:
Night reader wrote:The number is being divided by 1.5 instead of being multiplied by 5. What is the percentage of error obtained?

A. 30%
B. 40%
C. 50%
D. 60%
E. 70%
Number = x
Error=5x-2x/3 = 13x/3

percentage = (13x/3)/5x * 100 = 1300/15 % ~= 86.67%
Probably, I made some calc. mistake or the option needs to be edited.
Anshu, your solution is correct! I am going to edit answer E for matching the problem choices.
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by bblast » Wed Jan 12, 2011 5:01 am
I picked X as 150 and solved, same solution as Anshu.

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by tomada » Wed Jan 12, 2011 1:38 pm
Hi Night Reader,

Is this your own, homemade question?
I'm really old, but I'll never be too old to become more educated.
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by Stuart@KaplanGMAT » Wed Jan 12, 2011 1:45 pm
tomada wrote:Hi Night Reader,

Is this your own, homemade question?
Definitely - this is not a GMAT style question and not something about which GMAT students need to worry.
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