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# M60-02

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8033
GMAT 1: 760 Q51 V42
GPA: 3.82

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11 Jun 2018, 02:05
00:00

Difficulty:

25% (medium)

Question Stats:

86% (00:46) correct 14% (00:45) wrong based on 7 sessions

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The symbol $$⊙$$ represents one of the operations: addition, subtraction, multiplication, and division. Is $$2⊙2=4？$$

1) $$1⊙1=1$$

2) $$(-1) ⊙ (-1)=0$$

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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 $79 for 1 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 8033 GMAT 1: 760 Q51 V42 GPA: 3.82 Re M60-02 [#permalink] ### Show Tags 11 Jun 2018, 02:05 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. The first step of the VA (Variable Approach) method is to modify the original condition and the question, and then recheck the question. Since only 2 + 2 = 4 and 2 * 2 = 4, the question asks if ⊙ is addition or multiplication. Condition 1) Since 1 * 1 = 1 and 1 / 1 = 1, ⊙ is multiplication or division. Condition 1) is not sufficient. Condition 2) Since (-1) - (-1) = 0, ⊙ is subtraction. The answer is "no". CMT1 states that "no" is also an answer. Condition 2) is sufficient. 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$79 for 1 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
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Joined: 18 Nov 2014
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18 Jan 2019, 02:02
I think this is a high-quality question and I agree with explanation.
Intern
Joined: 08 Jan 2019
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Location: France
GPA: 3.5
WE: Consulting (Other)

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16 May 2019, 11:38
Good explanation
Intern
Joined: 03 Jul 2019
Posts: 15
Location: United States (NY)
GMAT 1: 760 Q49 V44
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29 Aug 2019, 23:06
1
I was under the impression that the conditions for data sufficiency questions would never contradict one another; if ⊙ is multiplication or division per 1, but subtraction per 2, isn't the question aporetic?
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Joined: 02 Sep 2009
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29 Aug 2019, 23:11
1
donnaglaraway wrote:
I was under the impression that the conditions for data sufficiency questions would never contradict one another; if ⊙ is multiplication or division per 1, but subtraction per 2, isn't the question aporetic?

You are right. The statements should not contradict each other (or the stem). The question is flawed as per GMAT standards.
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Location: United States (NY)
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29 Aug 2019, 23:12
I'M GONNA SUE

(thanks bunuel )
Re: M60-02   [#permalink] 29 Aug 2019, 23:12
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# M60-02

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