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# Modulas

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Senior Manager
Joined: 08 Nov 2008
Posts: 258
Modulas  [#permalink]

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22 Mar 2009, 08:49
If modulas (d-9)= 2d, then d = ??

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Joined: 07 Oct 2008
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Re: Modulas  [#permalink]

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22 Mar 2009, 19:33
After simplifying the eq |d-9| = 2d
the values of d are -9 and 3

but substituting it back to the eq will work only for value "3"

so ans is 3

Let me know what other think..
Intern
Joined: 07 Feb 2009
Posts: 46
Re: Modulas  [#permalink]

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22 Mar 2009, 23:12
I agree with you, z102478.
I am also getting 3 as the answer.

Lets solve it with some explanation, so that everybody gets a clear idea.

As we have the expression, |d-9| = 2d , it means -

Case 1
______________
d-9 = 2d if d-9>0
or, d = -9 if d>9

d can't be -9 as it has to be greater than 9.(Result doesn't agree with the condition provided)

Case 2
____________________
d-9 = -2d if d-9<0
or, 3d = 9 if d<9
or, d=3 if d<9

d can take a value of 3 in this case as d is less than 3.

Hence, the value of d has to be 3.
Senior Manager
Joined: 08 Nov 2008
Posts: 258
Re: Modulas  [#permalink]

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23 Mar 2009, 03:40
Ans is 3

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________

"CEO in making"

Re: Modulas &nbs [#permalink] 23 Mar 2009, 03:40
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# Modulas

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