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M60-21

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6661
GMAT 1: 760 Q51 V42
GPA: 3.82

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Updated on: 05 Aug 2018, 21:55
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50% (01:55) correct 50% (01:24) wrong based on 2 sessions

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If 3x - y ≠ 0, what is the value of (x+3y)/(3x-y)?

1) $$x-2y = 1$$

2) $$x-2y = 0$$

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only $99 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Originally posted by MathRevolution on 11 Jun 2018, 05:48. Last edited by MathRevolution on 05 Aug 2018, 21:55, edited 1 time in total. Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 6661 GMAT 1: 760 Q51 V42 GPA: 3.82 Re: M60-21 [#permalink] Show Tags 11 Jun 2018, 05:49 1 Official Solution: Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution. When the question asks for a ratio, a fraction, a percent, a proportion or a rate, if one of conditions provides a ratio and the other condition provides a number, the condition with a ratio could be sufficient. This question asks for a ratio. Condition 1) provides a number and condition 2) provides the ratio, x/y = 2. Thus, condition 2) is likely to be sufficient. Condition 1) : If $$x = 3$$ and $$y = 1$$, then $$(x+3y)/(3x-y) = 6/8 = 3/4$$ If $$x = 5$$ and $$y = 2$$, then $$(x+3y)/(3x-y) = 16/13$$ Since we do not obtain a unique answer, condition 1) is not sufficient. Condition 2) : Since $$x = 2y$$, $$(x+3y)/(3x-y) = 5y/5y = 1$$. Condition 2) is sufficient. Therefore, B is the answer. Answer: B _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$99 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
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Joined: 08 Jun 2013
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03 Aug 2018, 23:43
MathRevolution wrote:
What is the value of (x+3y)/(3x-y)?

1) $$x-2y = 1$$

2) $$x-2y = 0$$

I have a doubt.

from condition 2) one solution for x and y can be x = y = 0

In this case original expression - (x+3y)/(3x-y) can not have answer.

Pl clarify.

Bunuel chetan2u ScottTargetTestPrep
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It seems Kudos button not working correctly with all my posts...

Please check if it is working with this post......

is it?....

Anyways...Thanks for trying

Re: M60-21 &nbs [#permalink] 03 Aug 2018, 23:43
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