GMAT Question of the Day - Daily to your Mailbox; hard ones only

It is currently 20 Aug 2019, 18:17

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.

Close

Request Expert Reply

Confirm Cancel

Which of the following is the closest approximation to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 57155
Which of the following is the closest approximation to  [#permalink]

Show Tags

New post 17 Jun 2019, 00:50
00:00
A
B
C
D
E

Difficulty:

  75% (hard)

Question Stats:

47% (01:49) correct 53% (02:11) wrong based on 68 sessions

HideShow timer Statistics

GMAT Club Legend
GMAT Club Legend
User avatar
D
Joined: 18 Aug 2017
Posts: 4491
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member CAT Tests
Re: Which of the following is the closest approximation to  [#permalink]

Show Tags

New post 17 Jun 2019, 09:08
\([\sqrt{73} * \sqrt{239}] ÷ [\sqrt{7.2} + \sqrt{15.7}]
8*15/(2+4) = 20
IMO C


Bunuel wrote:
Which of the following is the closest approximation to [m][\sqrt{73} * \sqrt{239}] ÷ [\sqrt{7.2} + \sqrt{15.7}]\)?

A. 10
B. 15
C. 20
D. 25
E. 30

_________________
If you liked my solution then please give Kudos. Kudos encourage active discussions.
Intern
Intern
avatar
S
Joined: 27 Mar 2019
Posts: 21
Re: Which of the following is the closest approximation to  [#permalink]

Show Tags

New post 17 Jun 2019, 13:12
Here we have can see that √ of 73 is close to 81 rather than 64 so the closest value for it would be 9. Similarly √ of 239 is closest to the value of √ of 225, i.e 15.

Hence 9*15/2+4 = 19.28 which is closest to 20. So IMO : it's C
Target Test Prep Representative
User avatar
D
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 7408
Location: United States (CA)
Re: Which of the following is the closest approximation to  [#permalink]

Show Tags

New post 19 Jun 2019, 18:37
Bunuel wrote:
Which of the following is the closest approximation to \([\sqrt{73} * \sqrt{239}] ÷ [\sqrt{7.2} + \sqrt{15.7}]\)?

A. 10
B. 15
C. 20
D. 25
E. 30



√73 is about 8.5.

√239 is about 15.5.

√7.2 is about 3.

√15.7 is about 4.

15.5 x 8.5 = 131.75 or about 130

3 + 4 = 7

Thus,

130/7 is about 20.

Answer: C
_________________

Scott Woodbury-Stewart

Founder and CEO

Scott@TargetTestPrep.com
TTP - Target Test Prep Logo
122 Reviews

5-star rated online GMAT quant
self study course

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button.

Manager
Manager
User avatar
S
Joined: 18 Dec 2017
Posts: 162
Re: Which of the following is the closest approximation to  [#permalink]

Show Tags

New post 07 Aug 2019, 22:49
Bunuel wrote:
Which of the following is the closest approximation to \([\sqrt{73} * \sqrt{239}] ÷ [\sqrt{7.2} + \sqrt{15.7}]\)?

A. 10
B. 15
C. 20
D. 25
E. 30


I calculated the lowest and highest possible values of the expressions.
Lowest means (8*15)/(2+3) and highest means (9*16)/(3+4). The results are 24 and 20.XX. So the closest approximation is 20.

P.S: 25 cannot be the answer as the max value is 24 so C it is
_________________
Please be generous in giving kudos :)
“Practice is the hardest part of learning, and training is the essence of transformation.” ― Ann Voskamp
Software Tester currently in USA ( ;-) )
GMAT Club Bot
Re: Which of the following is the closest approximation to   [#permalink] 07 Aug 2019, 22:49
Display posts from previous: Sort by

Which of the following is the closest approximation to

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne