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# 6/√5-√5/5=?

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 8456
GMAT 1: 760 Q51 V42
GPA: 3.82

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23 May 2019, 01:45
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Difficulty:

5% (low)

Question Stats:

86% (00:50) correct 14% (01:39) wrong based on 44 sessions

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[GMAT math practice question]

$$\frac{6}{√5}-\frac{√5}{5}=?$$

$$A. 1$$

$$B. -1$$

$$C. √5$$

$$D. -√5$$

$$E. 2√5$$

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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" Manager Joined: 29 Nov 2018 Posts: 85 Location: India GPA: 4 WE: Information Technology (Consulting) Re: 6/√5-√5/5=? [#permalink] ### Show Tags 23 May 2019, 13:28 MathRevolution wrote: [GMAT math practice question] $$\frac{6}{√5}-\frac{√5}{5}=?$$ $$A. 1$$ $$B. -1$$ $$C. √5$$ $$D. -√5$$ $$E. 2√5$$ Let $$\frac{6}{√5}-\frac{√5}{5}=X$$ now multiply with \sqrt{5} => 6 - 1 = X\sqrt{5} X = 5/\sqrt{5} X = \sqrt{5} Option C _________________ Hope it helps, Thanks, Mofe Bhatia Senior Manager Joined: 20 Mar 2018 Posts: 442 Location: Ghana Concentration: Finance, Real Estate Re: 6/√5-√5/5=? [#permalink] ### Show Tags 24 May 2019, 01:34 6/(root 5) - (root 5)/5 (root 5)/(root 5)6/(root 5) - (root 5)/5 6(root5)/5 - (root 5)/5 (6(root 5) - (root 5))/5 5(root 5)/5 => (root 5) Answer C Posted from my mobile device Manager Joined: 17 Jul 2018 Posts: 74 Location: India Concentration: Finance, Leadership GMAT 1: 760 Q50 V44 GPA: 4 6/√5-√5/5=? [#permalink] ### Show Tags 24 May 2019, 02:03 MathRevolution wrote: [GMAT math practice question] $$\frac{6}{√5}-\frac{√5}{5}=?$$ $$A. 1$$ $$B. -1$$ $$C. √5$$ $$D. -√5$$ $$E. 2√5$$ $$\frac{6}{√5}-\frac{√5}{5}$$ = $$\frac{(6√5-√5)}{5}$$ = $$\frac{5√5}{5}$$ = √5. C is the answer. Please take time to hit+1 Kudos Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 8456 GMAT 1: 760 Q51 V42 GPA: 3.82 6/√5-√5/5=? [#permalink] ### Show Tags 26 May 2019, 18:42 => $$\frac{6}{\sqrt{5}}-\frac{√5}{5}$$ $$= \frac{6√5}{√5√5}-\frac{√5}{5}$$ $$= \frac{6√5}{5}-\frac{√5}{5}$$ $$= \frac{5√5}{5} =√5$$ Therefore, the answer is C. Answer: C _________________ 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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6/√5-√5/5=?   [#permalink] 26 May 2019, 18:42
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