NEW HERE? LEARN MORE
closeclose
It is currently 03 Dec 2023, 17:06
Register
GMAT Club Tests
GMAT Club Tests
Decision Tracker
My Rewards
New posts
New comers' posts

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel

Of the following, which is the closest approximation to 32/0.256^(1/2)

6 posts Go to First Unread Post
Print view
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
SORT BY:
Date
Kudos
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 90065
CAT Tests Forum Quiz Mode
Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink] New post  22 May 2020, 05:38
36
Bookmarks
Expert Reply
00:00
A
B
C
D
E

Difficulty:

45% (medium)

Question Stats:

65% (01:28) correct 35% (01:39) wrong based on 662 sessions

Hide Show timer Statistics

Of the following, which is the closest approximation to \(\frac{32}{\sqrt{0.256}}=\) ?

A. 20
B. 30
C. 60
D. 200
E. 600


PS21251
ShowHide Answer
Official Answer
Official Answer and Stats are available only to registered users. Register/Login.

_________________
New to the GMAT CLUB Forum?

My Signature Questions' Collection:


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics
Signature Read More
Most Helpful Reply
User avatar
L
IanStewart
GMAT Tutor
Joined: 24 Jun 2008
Posts: 4130
Re: Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink] New post  22 May 2020, 06:12
6
Kudos
2
Bookmarks
Expert Reply
Or you can notice that √0.25 = √(1/4) = 1/2, and √0.256 is therefore very close to 1/2. So 32/√0.256 ~ 32/(1/2) = 64, and C is the answer.
_________________
http://www.ianstewartgmat.com
Signature Read More
User avatar
L
GMATinsight
GMAT Club Legend
GMAT Club Legend
Joined: 08 Jul 2010
Status:GMAT/GRE Tutor l Admission Consultant l On-Demand Course creator
Posts: 5881
Location: India
GMAT: QUANT EXPERT
Schools: IIM (A) ISB '24
GMAT 1: 750 Q51 V41
WE:Education (Education)
Reviews Badge
Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink] New post  22 May 2020, 05:44
5
Kudos
3
Bookmarks
Expert Reply
Bunuel wrote:
Of the following, which is the closest approximation to \(\frac{32}{\sqrt{0.256}}=\) ?

A. 20
B. 30
C. 60
D. 200
E. 600


PS21251


\(\frac{32}{\sqrt{0.256}}= \frac{32}{√(256/1000)} = \frac{32*√1000 }{ √256} = \frac{32(10*√10) }{ 16} = 20√10 ≈ 20*3 = 60\)

ANswer: Option C
General Discussion
User avatar
L
Abhishek009
Board of Directors
Joined: 11 Jun 2011
Status:QA & VA Forum Moderator
Posts: 5889
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
GMAT ToolKit User
Re: Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink] New post  22 May 2020, 07:16
Bunuel wrote:
Of the following, which is the closest approximation to \(\frac{32}{\sqrt{0.256}}=\) ?

A. 20
B. 30
C. 60
D. 200
E. 600


PS21251


\(0.50*0.50 = 0.25\)

\(\frac{32}{\sqrt{0.256}}\)

= \(\frac{32}{0.50}\)

= \(64\)

~ \(60\), Answer must be (C)
_________________
Thanks and Regards

Abhishek....

PLEASE FOLLOW THE RULES FOR POSTING IN QA AND VA FORUM AND USE SEARCH FUNCTION BEFORE POSTING NEW QUESTIONS

How to use Search Function in GMAT Club | Rules for Posting in QA forum | Writing Mathematical Formulas |Rules for Posting in VA forum | Request Expert's Reply ( VA Forum Only )
Signature Read More
User avatar
L
BrentGMATPrepNow
GMAT Club Legend
GMAT Club Legend
Joined: 11 Sep 2015
Posts: 6855
Location: Canada
Re: Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink] New post  27 Jun 2022, 07:47
1
Kudos
Expert Reply
Top Contributor
Bunuel wrote:
Of the following, which is the closest approximation to \(\frac{32}{\sqrt{0.256}}=\) ?

A. 20
B. 30
C. 60
D. 200
E. 600


PS21251


We can save a lot of time by recognizing 0.256 ≈ 0.25, and that √0.25 = 0.5 (since 0.5² = 0.25)

So, we get: \(\frac{32}{\sqrt{0.256}}≈ \frac{32}{\sqrt{0.25}} ≈ \frac{32}{0.5} ≈ 64\)

Answer: C
User avatar
bumpbot
Non-Human User
Joined: 09 Sep 2013
Posts: 30769
Re: Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink] New post  12 Oct 2023, 10:06
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.
_________________
GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources
Signature Read More
GMAT Club Bot
gmatclubot
Re: Of the following, which is the closest approximation to 32/0.256^(1/2) [#permalink]
12 Oct 2023, 10:06
NEW TOPIC
POST REPLY
Downloads
My Bookmarks
Reviews
Moderators:
Bunuel
Math Expert
90065 posts
yashikaaggarwal
Senior Moderator - Masters Forum
3141 posts

cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions