Forum Home > GMAT > Quantitative > Problem Solving (PS)
Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Dec 1511:00 AM IST
-01:00 PM IST
Attend this free GMAT Algebra Webinar and learn how to master the most challenging Inequalities and Absolute Value problems with ease.
Dec 1410:00 AM EST
-12:00 PM EST
Think a 100% GMAT Verbal score is out of your reach? Target Test Prep will make you think again! Our course uses techniques such as topical study and spaced repetition to maximize knowledge retention and make studying simple and fun.- Dec 14
11:00 AM IST
-01:00 PM IST
Attend this session to learn how to Deconstruct arguments, Pre-Think Author’s Assumptions, and apply Negation Test. 
Dec 1608:00 AM PST
-11:59 PM PST
GMAT Club 12 Days of Christmas is a 4th Annual GMAT Club Winter Competition based on solving questions. This is the Winter GMAT competition on GMAT Club with an amazing opportunity to win over $40,000 worth of prizes!- Dec 17
09:00 AM PST
-10:00 AM PST
Join Manhattan Prep instructor Whitney Garner for a fun—and thorough—review of logic-based (non-math) problems, with a particular emphasis on Data Sufficiency and Two-Parts. - Dec 18
10:00 AM PST
-11:00 AM PST
Here is the essential guide to securing scholarships as an MBA student! In this video, we explore the various types of scholarships available, including need-based and merit-based options.
24 Sep 2015, 22:52
Kudos
Bookmarks
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:
92% (00:57) correct
8%
(01:40)
wrong
based on 98
sessions
History
Date
Time
Result
Not Attempted Yet
For all numbers a and b, the operation && is defined by a&&b = (a + 2)(b – 3).
If 3 && x = –45, then x =
(A) –15
(B) –6
(C) 3
(D) 6
(E) 15
Kudos for a correct solution.
If 3 && x = –45, then x =
(A) –15
(B) –6
(C) 3
(D) 6
(E) 15
Kudos for a correct solution.
25 Sep 2015, 07:13
Kudos
Bookmarks
Bunuel
For all numbers a and b, the operation && is defined by a&&b = (a + 2)(b – 3).
If 3 && x = –45, then x =
(A) –15
(B) –6
(C) 3
(D) 6
(E) 15
Kudos for a correct solution.
If 3 && x = –45, then x =
(A) –15
(B) –6
(C) 3
(D) 6
(E) 15
Kudos for a correct solution.
(3+2)(x-3)=-45..
x-3=-9..
x=-6
B
29 Sep 2015, 20:49
Kudos
Bookmarks
Hi All,
This is an example of a 'symbolism' question. In most cases, symbolism questions involve basic arithmetic or algebra and are just about following the 'instructions' that you're given. Here, an Algebraic approach will work nicely to get you to the correct answer. You can also get to the solution by using some Number Properties and TESTing THE ANSWERS.
We're told that....
A && B = (A+2)(B-3)
We're asked to figure out the value of X in the following equation....
3 && X = -45
Since the given symbol involves multiplying two parentheses, and the product is -45, one parentheses must be POSITIVE while the other is NEGATIVE.
Substituting the '3' for the 'A' gives us (3+2) = (5), so that is the POSITIVE term. Thus, (B-3) must be NEGATIVE. To make that parentheses negative, we need B to be LESS than 3. That eliminates the last 3 answer choices (C, D and E).
Let's TEST Answer B (since it will be easier math)....
3 && - 6 = (3+2)(-6 -3) = (5)(-9) = -45
This is an exact match for what we were told, so this MUST be the answer.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
This is an example of a 'symbolism' question. In most cases, symbolism questions involve basic arithmetic or algebra and are just about following the 'instructions' that you're given. Here, an Algebraic approach will work nicely to get you to the correct answer. You can also get to the solution by using some Number Properties and TESTing THE ANSWERS.
We're told that....
A && B = (A+2)(B-3)
We're asked to figure out the value of X in the following equation....
3 && X = -45
Since the given symbol involves multiplying two parentheses, and the product is -45, one parentheses must be POSITIVE while the other is NEGATIVE.
Substituting the '3' for the 'A' gives us (3+2) = (5), so that is the POSITIVE term. Thus, (B-3) must be NEGATIVE. To make that parentheses negative, we need B to be LESS than 3. That eliminates the last 3 answer choices (C, D and E).
Let's TEST Answer B (since it will be easier math)....
3 && - 6 = (3+2)(-6 -3) = (5)(-9) = -45
This is an exact match for what we were told, so this MUST be the answer.
Final Answer:
GMAT assassins aren't born, they're made,
Rich
