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Number Properties question?

This topic has 4 expert replies and 0 member replies
AbeNeedsAnswers Master | Next Rank: 500 Posts Default Avatar
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Number Properties question?

Post Mon Jul 03, 2017 8:23 pm
Is there a secret to these question types?

If 0 < a < b < c, which of the following statements must be true?

I. 2a > b + c
II. c - a > b - a
III. c/a < b/a

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

B

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Post Tue Jul 11, 2017 9:59 am

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Top Reply
Post Tue Jul 11, 2017 9:55 am
AbeNeedsAnswers wrote:
Is there a secret to these question types?
If by that you mean Roman Numeral questions, then... no. RN's make it impossible to backsolve, estimate, or use a lot of the other tactics we can use on other PS questions. Don't try to game it based on whether I, II, or III shows up most often in answer choices.

They come in 2 flavors:

Which of the following MUST be true?
For these, try to DISPROVE each RN option. Try to think of a value / circumstance in which it would be untrue. Make sure to test extremes (very big & small), zero, negatives, fractions, etc, where applicable.

Which of the following COULD be true?
These are less common. For these, you just need to come up with an example that could be true in 1 circumstance.

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


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Post Tue Jul 11, 2017 9:59 am

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

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Thanked by: gmatdestroyer13
Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.
Post Tue Jul 11, 2017 9:55 am
AbeNeedsAnswers wrote:
Is there a secret to these question types?
If by that you mean Roman Numeral questions, then... no. RN's make it impossible to backsolve, estimate, or use a lot of the other tactics we can use on other PS questions. Don't try to game it based on whether I, II, or III shows up most often in answer choices.

They come in 2 flavors:

Which of the following MUST be true?
For these, try to DISPROVE each RN option. Try to think of a value / circumstance in which it would be untrue. Make sure to test extremes (very big & small), zero, negatives, fractions, etc, where applicable.

Which of the following COULD be true?
These are less common. For these, you just need to come up with an example that could be true in 1 circumstance.

_________________


Ceilidh Erickson
Manhattan Prep GMAT & GRE instructor
EdM in Mind, Brain, and Education
Harvard Graduate School of Education


Manhattan Prep instructors all have 99th+ percentile scores and expert teaching experience.
Sign up for a FREE TRIAL, and learn why we have the highest ratings in the GMAT industry!

  • +1 Upvote Post
  • Quote
  • Flag
Thanked by: gmatdestroyer13
Free Manhattan Prep online events - The first class of every online Manhattan Prep course is free. Classes start every week.

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