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

It is currently 18 Apr 2019, 15:39

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

In the figure above, L2 is perpendicular to L1 . Which of the followi

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

Hide Tags

 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 54370
In the figure above, L2 is perpendicular to L1 . Which of the followi  [#permalink]

Show Tags

New post 19 Jul 2017, 03:26
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

94% (00:35) correct 6% (01:02) wrong based on 53 sessions

HideShow timer Statistics

Image
In the figure above, L2 is perpendicular to L1. Which of the following must be true?

I. a = 70
II. If a = 70, then b = 20
III. If b = 20, then a = 70

(A) I only
(B) II only
(C) III only
(D) II and III only
(E) I, II and III


Attachment:
2017-07-19_1425.png
2017-07-19_1425.png [ 10.84 KiB | Viewed 1160 times ]

_________________
Intern
Intern
avatar
B
Joined: 02 Oct 2015
Posts: 11
Re: In the figure above, L2 is perpendicular to L1 . Which of the followi  [#permalink]

Show Tags

New post 19 Jul 2017, 03:46
Bunuel wrote:
Image
In the figure above, L2 is perpendicular to L1. Which of the following must be true?

I. a = 70
II. If a = 70, then b = 20
III. If b = 20, then a = 70

(A) I only
(B) II only
(C) III only
(D) II and III only
(E) I, II and III


Attachment:
2017-07-19_1425.png


1) a=70, this could be true, but "a" can take any value between 0 and 90 degrees. False
2) Since "L2" is perpendicular to "L1", then they form a 90 degrees angle, so "a+b" should be always equal to 90, a+b=70+20=90, True
3) Same reasoning as above, a+b=20+70=90. True

The answer is (D)
SVP
SVP
avatar
B
Joined: 06 Nov 2014
Posts: 1877
Re: In the figure above, L2 is perpendicular to L1 . Which of the followi  [#permalink]

Show Tags

New post 19 Jul 2017, 09:28
Bunuel wrote:
Image
In the figure above, L2 is perpendicular to L1. Which of the following must be true?

I. a = 70
II. If a = 70, then b = 20
III. If b = 20, then a = 70

(A) I only
(B) II only
(C) III only
(D) II and III only
(E) I, II and III


Attachment:
2017-07-19_1425.png


I. a = 70
II. If a = 70, then b = 20
III. If b = 20, then a = 70

Statement 1 may or may not be true always
Statement 2 and 3 will always be true because the sum of a and b will be 90

Correct Option: D
Intern
Intern
avatar
B
Joined: 17 Dec 2015
Posts: 17
Re: In the figure above, L2 is perpendicular to L1 . Which of the followi  [#permalink]

Show Tags

New post 23 Jul 2017, 20:08
Looking at the question. Option 1 can be easily ruled out as angle a can take any value (figure not drawn to scale) ,hence ll and III looks correct. Ans. D.

Sent from my ONEPLUS A5000 using GMAT Club Forum mobile app
Target Test Prep Representative
User avatar
G
Status: Head GMAT Instructor
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2825
Re: In the figure above, L2 is perpendicular to L1 . Which of the followi  [#permalink]

Show Tags

New post 25 Jul 2017, 11:03
Bunuel wrote:
Image
In the figure above, L2 is perpendicular to L1. Which of the following must be true?

I. a = 70
II. If a = 70, then b = 20
III. If b = 20, then a = 70

(A) I only
(B) II only
(C) III only
(D) II and III only
(E) I, II and III


Using the figure above, we see that a + b = 90.

Let’s analyze each Roman numeral.

I. a = 70

Since we know only that the sum of a and b is 90, we cannot determine whether a = 70. Roman numeral I does not have to be true.

II. If a = 70, then b = 20

Since the sum of a and b is 90, if a = 70, then b = 20. II is true.

III. If b = 20, then a = 70

For the same reasons mentioned in II, III is true.

Answer: D
_________________

Jeffrey Miller

Head of GMAT Instruction

Jeff@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

GMAT Club Bot
Re: In the figure above, L2 is perpendicular to L1 . Which of the followi   [#permalink] 25 Jul 2017, 11:03
Display posts from previous: Sort by

In the figure above, L2 is perpendicular to L1 . Which of the followi

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


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.