If x=kc and y=kt,then y-x =? : GMAT Problem Solving (PS)
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# If x=kc and y=kt,then y-x =?

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Intern
Joined: 27 Feb 2012
Posts: 37
Followers: 1

Kudos [?]: 21 [0], given: 5

If x=kc and y=kt,then y-x =? [#permalink]

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04 Feb 2013, 14:37
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Difficulty:

5% (low)

Question Stats:

92% (01:14) correct 8% (00:25) wrong based on 118 sessions

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If x=kc and y=kt,then y-x =?

A) k(t-c)
B) k(c-t)
C) c(k-t)
D) t(k-c)
E) k(1-t)
[Reveal] Spoiler: OA
Veritas Prep GMAT Instructor
Joined: 16 Oct 2010
Posts: 7125
Location: Pune, India
Followers: 2137

Kudos [?]: 13673 [1] , given: 222

Re: If x=kc and y=kt,then y-x =? [#permalink]

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04 Feb 2013, 20:13
1
KUDOS
Expert's post
jsphcal wrote:
If x=kc and y=kt,then y-x =?

A) k(t-c)
B) k(c-t)
C) c(k-t)
D) t(k-c)
E) k(1-t)

Just put in the given values of y and x

y - x = kt - kc

Now take k common

y - x = k(t - c)

I would suggest you to go through a basic algebra book before moving on because it is necessary for you to know how to manipulate an equation (and related algebra) to do well in Quant.
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Get started with Veritas Prep GMAT On Demand for $199 Veritas Prep Reviews GMAT Club Legend Joined: 09 Sep 2013 Posts: 13468 Followers: 575 Kudos [?]: 163 [0], given: 0 Re: If x=kc and y=kt,then y-x =? [#permalink] ### Show Tags 27 Jul 2015, 22:02 Hello from the GMAT Club BumpBot! Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos). Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email. _________________ EMPOWERgmat Instructor Status: GMAT Assassin/Co-Founder Affiliations: EMPOWERgmat Joined: 19 Dec 2014 Posts: 8304 Location: United States (CA) GMAT 1: 800 Q51 V49 GRE 1: 340 Q170 V170 Followers: 381 Kudos [?]: 2465 [0], given: 163 Re: If x=kc and y=kt,then y-x =? [#permalink] ### Show Tags 27 Jul 2015, 22:35 Hi All, Most Test Takers would probably solve this problem using Algebra, as substituting in the given values is a fairly straight-forward bit of 'math.' This question can also be solved by TESTing VALUES... We're told that.... X = (K)(C) Y = (K)(T) We're asked for the value of Y-X... IF.... K = 1 C = 2 T = 3 X = (1)(2) = 2 Y = (1)(3) = 3 Y-X = 3-2 = 1 Answer A: K(T-C) = 1(3-2) = 1 This IS a MATCH Answer B: K(C-T) = 1(2-3) = -1 NOT a match Answer C: C(K-T) = 2(1-3) = -4 NOT a match Answer D: T(K-C) = 3(1-2) = -3 NOT a match Answer E: K(1-T) = 1(1-3) = -2 NOT a match Final Answer: [Reveal] Spoiler: A GMAT assassins aren't born, they're made, Rich _________________ # Rich Cohen Co-Founder & GMAT Assassin # Special Offer: Save$75 + GMAT Club Tests

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Joined: 08 Jul 2010
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Kudos [?]: 1410 [0], given: 42

Re: If x=kc and y=kt,then y-x =? [#permalink]

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28 Jul 2015, 07:24
jsphcal wrote:
If x=kc and y=kt,then y-x =?

A) k(t-c)
B) k(c-t)
C) c(k-t)
D) t(k-c)
E) k(1-t)

Given : x=kc and y=kt

Question y - x = ?

y - x = kt - kc = k (t-c)

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Feel free to give a Kudos if it is a useful post .

Re: If x=kc and y=kt,then y-x =?   [#permalink] 28 Jul 2015, 07:24
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