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.
Nov 2211:00 AM IST
-01:00 PM IST
Do RC/MSR passages scare you? e-GMAT is conducting a masterclass to help you learn – Learn effective reading strategies Tackle difficult RC & MSR with confidence Excel in timed test environment- Nov 23
11:00 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. 
Nov 2510:00 AM EST
-11:00 AM EST
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors.
15 Nov 2018, 02:48
Kudos
Bookmarks
[Math Revolution GMAT math practice question]
(number property) Is the \(5\)-digit positive integer \(abc000\) divisible by \(24\)?
1) The \(3\)-digit integer \(abc\) is divisible by \(8\).
2) The \(3\)-digit integer \(abc\) is divisible by \(3\).
(number property) Is the \(5\)-digit positive integer \(abc000\) divisible by \(24\)?
1) The \(3\)-digit integer \(abc\) is divisible by \(8\).
2) The \(3\)-digit integer \(abc\) is divisible by \(3\).
Updated on: 05 Mar 2022, 04:14
Originally posted by MathRevolution on 16 Nov 2018, 03:16.
Last edited by MathRevolution on 05 Mar 2022, 04:14, edited 2 times in total.
Last edited by MathRevolution on 05 Mar 2022, 04:14, edited 2 times in total.
Kudos
Bookmarks
MathRevolution
=>
Forget conventional ways of solving math questions. For DS problems, the VA (Variable Approach) method is the quickest and easiest way to find the answer without actually solving the problem. Remember that equal numbers of variables and independent equations ensure a solution.
The first step of the VA (Variable Approach) method is to modify the original condition and the question. We then recheck the question.
The question \(\frac{|x|}{x} = -1\) is equivalent to \(x ≤ 0\) as shown below:
\(\frac{|x|}{x} = -1\)
\(=> |x| = -x\)
\(=> x ≤ 0\)
Since we have 1 variable (x) and 0 equations, D is most likely to be the answer. So, we should consider each of the conditions on their own first.
Condition 1)
If \(x > 0\), then “\(x ≤ 0\)” is always false, and the answer is ‘no’.
Since ‘no’ is also a unique answer by CMT (Common Mistake Type) 1, condition 1) is sufficient.
Condition 2)
In inequality questions, the law “Question is King” tells us that if the solution set of the question includes the solution set of the condition, then the condition is sufficient
Condition 2) is not sufficient, since the solution set of the question does not include the solution set of condition 2).
Therefore, A is the answer.
Answer: A
If the original condition includes “1 variable”, or “2 variables and 1 equation”, or “3 variables and 2 equations” etc., one more equation is required to answer the question. If each of conditions 1) and 2) provide an additional equation, there is a 59% chance that D is the answer, a 38% chance that A or B is the answer, and a 3% chance that the answer is C or E. Thus, answer D (conditions 1) and 2), when applied separately, are sufficient to answer the question) is most likely, but there may be cases where the answer is A,B,C or E.
16 Nov 2018, 03:18
Kudos
Bookmarks
[Math Revolution GMAT math practice question]
(function) If \(f(x)=x^2\) when \(x<0\) and \(f(x)=x\)when \(x≥0\), what is the value of \(f(a)\)?
\(1) |a|=1\)
\(2) a^2-a = 0\)
(function) If \(f(x)=x^2\) when \(x<0\) and \(f(x)=x\)when \(x≥0\), what is the value of \(f(a)\)?
\(1) |a|=1\)
\(2) a^2-a = 0\)
