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

 It is currently 23 Aug 2019, 23:58

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

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

If a + b = 2 and 3a – b = –14, then what is ab?

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

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 57281
If a + b = 2 and 3a – b = –14, then what is ab?  [#permalink]

Show Tags

22 Jul 2019, 00:46
00:00

Difficulty:

15% (low)

Question Stats:

100% (00:45) correct 0% (00:00) wrong based on 15 sessions

HideShow timer Statistics

If a + b = 2 and 3a – b = –14, then what is ab?

A. -15
B. -3
C. 5
D. 10
E. 15

_________________
Manager
Joined: 18 May 2019
Posts: 164
Re: If a + b = 2 and 3a – b = –14, then what is ab?  [#permalink]

Show Tags

22 Jul 2019, 00:55
a+b=2 ............(1)
3a-b=-14 .........(2)
(1)+(2) 4a=-12
meaning a=-3
And putting a=-3 into (1) implies -3+b=2
Meaning b=5
ab= -3(5)=-15
Hence answer is A.

Posted from my mobile device
Re: If a + b = 2 and 3a – b = –14, then what is ab?   [#permalink] 22 Jul 2019, 00:55
Display posts from previous: Sort by

If a + b = 2 and 3a – b = –14, then what is ab?

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

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