GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

It is currently 30 May 2020, 04:47

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

(5*60 + 4*121)^(1/2)

  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: 64243
(5*60 + 4*121)^(1/2)  [#permalink]

Show Tags

New post 25 Jul 2018, 20:37
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

79% (01:37) correct 21% (01:51) wrong based on 63 sessions

HideShow timer Statistics

Math Expert
avatar
V
Joined: 02 Aug 2009
Posts: 8607
(5*60 + 4*121)^(1/2)  [#permalink]

Show Tags

New post 25 Jul 2018, 20:41
Bunuel wrote:
\(\sqrt{5*60 + 4*121}\)


A. \(10\sqrt{3}\)

B. 22

C. 28

D. 31

E. \(10\sqrt{3}+21\)



\(\sqrt{5*60 + 4*121}........\sqrt{5*5*2*2*3+2*2*11*11}=2\sqrt{75+121}=2√196=2*14=28\)

C
_________________
Manager
Manager
User avatar
G
Status: In last prep stage
Joined: 11 Jun 2017
Posts: 161
GMAT 1: 630 Q44 V33
GMAT 2: 680 Q47 V37
GPA: 3.2
(5*60 + 4*121)^(1/2)  [#permalink]

Show Tags

New post 25 Jul 2018, 20:42
Do multiply ,then add ,then root.
√5*60+4*121 =√300+484 =√784 =28
Ans=28
VP
VP
User avatar
D
Joined: 31 Oct 2013
Posts: 1489
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: (5*60 + 4*121)^(1/2)  [#permalink]

Show Tags

New post 25 Jul 2018, 21:04
Bunuel wrote:
\(\sqrt{5*60 + 4*121}\)


A. \(10\sqrt{3}\)

B. 22

C. 28

D. 31

E. \(10\sqrt{3}+21\)



Given
\(\sqrt{5*60 + 4*121}\)

\(\sqrt{4*15*5 + 4 *121}\)
VP
VP
User avatar
D
Joined: 31 Oct 2013
Posts: 1489
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: (5*60 + 4*121)^(1/2)  [#permalink]

Show Tags

New post 25 Jul 2018, 21:06
Bunuel wrote:
\(\sqrt{5*60 + 4*121}\)


A. \(10\sqrt{3}\)

B. 22

C. 28

D. 31

E. \(10\sqrt{3}+21\)



Given
\(\sqrt{5*60 + 4*121}\)

= \(\sqrt{4*15*5 + 4 *121}\)

=\(\sqrt{4( 15*5 + 121)}\)

= \(\sqrt{4*196}\)

= 28.

Note: 14*14 = 196 and 2*2 = 4

The best answer is C.
e-GMAT Representative
User avatar
V
Joined: 04 Jan 2015
Posts: 3374
Re: (5*60 + 4*121)^(1/2)  [#permalink]

Show Tags

New post 25 Jul 2018, 21:15

Solution



To find:
    • The value of the expression √(5*60 + 4*121)

Approach and Working:
We can rewrite the expression as follows:
    • \(\sqrt{(5*60 + 4*121)}\)
    = \(\sqrt{(300 + 484)}\)
    = \(\sqrt{784}\) = 28

Hence, the correct answer is option C.

Answer: C
_________________
GMAT Club Bot
Re: (5*60 + 4*121)^(1/2)   [#permalink] 25 Jul 2018, 21:15

(5*60 + 4*121)^(1/2)

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





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