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What is 63^(1/2)/147^(1/2)

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What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 22 Jun 2017, 22:47
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What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\frac{3}{7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)

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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 22 Jun 2017, 22:55
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


\(\frac{\sqrt{63}}{\sqrt{147}}\)

\(\sqrt{7*3*3/7*7*3}\)

\(\sqrt{3/7}\) . Answer (B)...
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 22 Jun 2017, 23:09
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


\(\frac{\sqrt{63}}{\sqrt{147}}\)
=\(\frac{\sqrt{3*3*7}}{\sqrt{3*7*7}}\)
=\(\frac{\sqrt{3}}{\sqrt{7}}\)

Answer B
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 08:44
Why the answer isn't C?

I divide both Numerator and Denominator by 3 and I get 21/49 under square root
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 10:18
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Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)



\(\sqrt{63} = 3\sqrt{7}\)
\(\sqrt{147} = 7\sqrt{3}\)

So, \(\frac{\sqrt{63}}{\sqrt{147}}\)

\(= 3\sqrt{7}/7\sqrt{3}\)

\(= 3\sqrt{7}*\sqrt{3}/7\sqrt{3}*\sqrt{3}\)

= \(3\sqrt{21}/7*3\)

= \(\frac{\sqrt{21}}{7}\)

Thus, answer will be (C)
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 10:26
+C

we must not leave square roots in denominator.
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What is 63^(1/2)/147^(1/2)  [#permalink]

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New post Updated on: 26 Jun 2017, 11:40
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?

\(\frac{\sqrt{63}}{\sqrt{147}}\)

\(\frac{\sqrt{7 * 3 * 3}}{\sqrt{7 * 7 *3}}\)

\(\frac{3 * \sqrt{7}}{7 * \sqrt{3}}\)

\(\frac{3 * \sqrt{7} * \sqrt{3}}{7 * \sqrt{3} * \sqrt{3}}\)

\(\frac{3 * \sqrt{21}}{7 * 3}\)

\(\frac{\sqrt{21}}{7}\)

Hence, Answer is C
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Originally posted by ydmuley on 26 Jun 2017, 10:37.
Last edited by ydmuley on 26 Jun 2017, 11:40, edited 1 time in total.
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 11:03
Abhishek009 wrote:
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)



\(\sqrt{63} = 3\sqrt{7}\)
\(\sqrt{147} = 7\sqrt{3}\)

So, \(\frac{\sqrt{63}}{\sqrt{147}}\)

\(= 3\sqrt{7}/7\sqrt{3}\)

\(= 3\sqrt{7}*\sqrt{3}/7\sqrt{3}*\sqrt{3}\)

= \(3\sqrt{21}/7*3\)

= \(\frac{\sqrt{21}}{7}\)

Thus, answer will be (C)


Hello Abhishek009 - Why not B in this case? Are you referring to any specific rule to solve this question?
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 11:07
1
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


Bunuel Option B and C are the same


B) √(3/7)
C) √21/7 = √3*√7/√7*√7= √(3/7)
.

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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 11:18
GMATinsight wrote:
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


Bunuel Option B and C are the same


B) √(3/7)
C) √21/7 = √3*√7/√7*√7= √(3/7)
.

Posted from my mobile device


Yes, formatting error there. B is simply \(\frac{3}{7}\), not \(\sqrt{3/7}\). Edited. Thank you.
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 11:43
ydmuley wrote:
Abhishek009 wrote:
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)



\(\sqrt{63} = 3\sqrt{7}\)
\(\sqrt{147} = 7\sqrt{3}\)

So, \(\frac{\sqrt{63}}{\sqrt{147}}\)

\(= 3\sqrt{7}/7\sqrt{3}\)

\(= 3\sqrt{7}*\sqrt{3}/7\sqrt{3}*\sqrt{3}\)

= \(3\sqrt{21}/7*3\)

= \(\frac{\sqrt{21}}{7}\)

Thus, answer will be (C)


Hello Abhishek009 - Why not B in this case? Are you referring to any specific rule to solve this question?


You can ignore this as Bunuel has changed the options.
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 11:56
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\frac{3}{7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


To resolve the confusion earlier in the thread, here's a recap:

- Originally, B incorrectly said \(\sqrt{\frac{3}{7}}\)
- This is actually the same as C, just simplified differently. \(\sqrt{\frac{3}{7}}\) and \(\frac{\sqrt{21}}{7}\) have the same value - you can plug them into a calculator to check.

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- Unfortunately, that means you can't eliminate answer choices just because they have a square root in the denominator (for example!).
- However, look out for situations where you simplify the answer in a certain way, and then you don't see that answer choice in the options - especially in problems that have square roots and exponents. Normally, you might assume that you got the wrong answer. However, it's possible that your answer is in the answer choices, but it's just written differently. Look out for that!
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 26 Jun 2017, 11:59
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\frac{3}{7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


\(\frac{\sqrt{63}}{\sqrt{147}}\)

\(\sqrt{3^2 * 7} / \sqrt{7^2 * 3}\)

\(3 \sqrt{7}/7\sqrt{3}\)

Multiplying numerator and denominator with \(\sqrt{3}\)

\(3 \sqrt{7} * \sqrt{3}\)\(/ 7 * \sqrt{3}\) * \(\sqrt{3}\)

\(3 \sqrt{21} / 7 * 3\)

\(\sqrt{21}/7\) . Answer (C)...
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 27 Jun 2017, 03:52
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\frac{3}{7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


√63/√147 < 8/12 = 0.64

A) √3/7 = 1.7/7= 0.2
B) (3/7) = 0.43
C) √21/7 = 4.6/7= 0.65
D) 3√21/7 = 1.8
E) 7/√3 = 4.1

I always prefer approximation in all such questions...

Answer Option C
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 28 Jun 2017, 15:51
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\frac{3}{7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)
'

We can simplify the given expression:

√63/√147 = (√9 x √7)/(√49 x √3) = (3√7)/(7√3)

Multiplying by √3/√3, we have:

(3√21)/21 = √21/7

Answer: C
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 29 Jun 2017, 08:38
sashiim20 wrote:
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)


\(\frac{\sqrt{63}}{\sqrt{147}}\)

\(\sqrt{7*3*3/7*7*3}\)

\(\sqrt{3/7}\) . Answer (B)...



Both B & C are correct. But now the option B has changed from \(\sqrt{3/7}\) to \(3/7\). So, wrt to current question, (C) is correct.
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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New post 29 Jun 2017, 08:40
Abhishek009 wrote:
Bunuel wrote:
What is \(\frac{\sqrt{63}}{\sqrt{147}}\)?


A. \(\frac{\sqrt{3}}{7}\)

B. \(\sqrt{3/7}\)

C. \(\frac{\sqrt{21}}{7}\)

D. \(\frac{3\sqrt{21}}{7}\)

E. \(\frac{7}{\sqrt{3}}\)



\(\sqrt{63} = 3\sqrt{7}\)

\(\sqrt{147} = 7\sqrt{3}\)

So, \(\frac{\sqrt{63}}{\sqrt{147}}\)

\(= 3\sqrt{7}/7\sqrt{3}\)

\(= 3\sqrt{7}*\sqrt{3}/7\sqrt{3}*\sqrt{3}\)

= \(3\sqrt{21}/7*3\)

= \(\frac{\sqrt{21}}{7}\)

Thus, answer will be (C)


Both B & C are correct. But now the option B has changed from \(\sqrt{3/7}\) to \(3/7\). So, wrt to current question, (C) is correct.
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Re: What is 63^(1/2)/147^(1/2)  [#permalink]

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