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Modulas

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Senior Manager
Senior Manager
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Joined: 08 Nov 2008
Posts: 298

Kudos [?]: 243 [0], given: 7

Modulas [#permalink]

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New post 22 Mar 2009, 08:49
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If modulas (d-9)= 2d, then d = ??
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"CEO in making"

Kudos [?]: 243 [0], given: 7

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Kudos [?]: 3 [0], given: 0

Re: Modulas [#permalink]

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New post 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..

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Kudos [?]: 16 [0], given: 1

Re: Modulas [#permalink]

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New post 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.

Kudos [?]: 16 [0], given: 1

Senior Manager
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Joined: 08 Nov 2008
Posts: 298

Kudos [?]: 243 [0], given: 7

Re: Modulas [#permalink]

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New post 23 Mar 2009, 03:40
Ans is 3 :)
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Kudos [?]: 243 [0], given: 7

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