Last visit was: 22 Apr 2026, 19:45 It is currently 22 Apr 2026, 19:45
Home
Messages
Tests
Schools
Events
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
Back to Forum
Create Topic
Sub 505 (Easy)|   Arithmetic|   Roots|            
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 22 Apr 2026
Posts: 109,754
Own Kudos:
810,673
 [4]
Given Kudos: 105,823
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,754
Kudos: 810,673
 [4]
What is the value of 17^(1/2) + 47^(1/2), to the nearest whole number? 14 Oct 2019, 06:27
1
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

89% (00:33) correct 11% (00:47) wrong based on 883 sessions

History

Date
Time
Result
Not Attempted Yet
What is the value of \(\sqrt{17} + \sqrt{47}\), to the nearest whole number?

A. 8
B. 11
C. 12
D. 15
E. 32
ShowHide Answer
Official Answer
B
If this question felt shaky, try an adaptive mini quiz of similar problems in GMAT Club Forum Quiz →. Free plan gives 5 questions per day.
avatar
linhmba
avatar
Joined: 17 Apr 2019
Last visit: 16 Jun 2020
Posts: 6
Own Kudos:
54
 [1]
Given Kudos: 29
Posts: 6
Kudos: 54
 [1]
What is the value of 17^(1/2) + 47^(1/2), to the nearest whole number? Updated on: 14 Oct 2019, 11:39
Originally posted by linhmba on 14 Oct 2019, 07:41.
Last edited by linhmba on 14 Oct 2019, 11:39, edited 1 time in total.
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
Close estimates are 4^2= 16; 7^2=49
7+4=11
Answer = B
User avatar
Abhishek009
User avatar
Board of Directors
Joined: 11 Jun 2011
Last visit: 17 Dec 2025
Posts: 5,904
Own Kudos:
5,450
 [1]
Given Kudos: 463
Status:QA & VA Forum Moderator
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
Posts: 5,904
Kudos: 5,450
 [1]
What is the value of 17^(1/2) + 47^(1/2), to the nearest whole number? 14 Oct 2019, 11:17
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
Bunuel
What is the value of \(\sqrt{17} + \sqrt{47}\), to the nearest whole number?

A. 8
B. 11
C. 12
D. 15
E. 32
Show more

\(4^2 = 16\) ~ \(17\\
[m]7^2 = 49\) ~ \(47\)

Hence, \(\sqrt{17} + \sqrt{47}\) ~ \(4 + 7 = 11\) , Answer must be (B)
User avatar
BrentGMATPrepNow
User avatar
Major Poster
Joined: 12 Sep 2015
Last visit: 31 Oct 2025
Posts: 6,733
Own Kudos:
36,446
Given Kudos: 799
Location: Canada
Expert
Expert reply
Posts: 6,733
Kudos: 36,446
What is the value of 17^(1/2) + 47^(1/2), to the nearest whole number? 13 Jun 2021, 15:15
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
What is the value of \(\sqrt{17} + \sqrt{47}\), to the nearest whole number?

A. 8
B. 11
C. 12
D. 15
E. 32
Show more

\(\sqrt{16} = 4\)
\(\sqrt{25} = 5\)
So, \(\sqrt{17} ≈ 4.1\)

\(\sqrt{36} = 6\)
\(\sqrt{49} = 7\)
So, \(\sqrt{47} ≈ 6.8\)

So, \(\sqrt{17} + \sqrt{47}≈4.1 + 6.8≈10.9\)

Answer: B
User avatar
CrackverbalGMAT
User avatar
Major Poster
Joined: 03 Oct 2013
Last visit: 22 Apr 2026
Posts: 4,846
Own Kudos:
9,180
Given Kudos: 226
Affiliations: CrackVerbal
Location: India
Expert
Expert reply
Posts: 4,846
Kudos: 9,180
What is the value of 17^(1/2) + 47^(1/2), to the nearest whole number? 18 Jun 2021, 05:45
Kudos
Add Kudos
Bookmarks
Bookmark this Post
A technique that I adopt when I have to deal with non-perfect square is to think of bigger perfect squares and then introduce decimals.

Now, instead of 17, let’s think of 1700. We know \(40^2\) = 1600 and \(41^2\) = 1681. Therefore, √1700 is just a shade above 41.
It is now easy for you to see that √17 will be a shade above 4.1

Similarly, \(70^2\) = 4900, so √4700 will be very close to 69 (less than 69).
So, √47 will be a shade below 6.9.

Therefore, √17 + √47 ≈ 4.1 + 6.9 = 11.

The correct answer option is B.

Hope that helps!
Aravind B T
User avatar
bot00078
User avatar
Joined: 08 Mar 2025
Last visit: 01 Apr 2026
Posts: 37
Own Kudos:
7
Given Kudos: 14
GMAT Focus 1: 345 Q70 V66 DI62
GMAT Focus 1: 345 Q70 V66 DI62
Posts: 37
Kudos: 7
What is the value of 17^(1/2) + 47^(1/2), to the nearest whole number? 02 Oct 2025, 02:28
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
What is the value of \(\sqrt{17} + \sqrt{47}\), to the nearest whole number?

A. 8
B. 11
C. 12
D. 15
E. 32
Show more
YO,
So Here Just Check the nearest Roots
\sqrt{16} which is 4 so there is \sqrt{17 } is a bit more than 4 i apporx it as 4.25
\sqrt{49} Which is 7 so here also \sqrt{47} which is <7 may be 6.50 or somthing, where the options are easy so the nearest Number is 11
Moderators:
Bunuel
Math Expert
109754 posts
Krunaal
Tuck School Moderator
853 posts