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You can frame the question as x = n•y ? where n is some integer. (1) $$^{y^2+y}$$ is NOT a factor of x. Rephrase this as y(y+1) is NOT a factor of x. Would this necessarily mean that y is Not a factor of x? Try numbers to see. (2) This can be rephrased as x(x^2 + 1) is NOT a multiple of y. This is...

by Gmatbuddy

Mon Jul 22, 2019 1:42 am
Forum: GMAT Math
Topic: If x and y are positive integers, is x a multiple of y? (1)
Replies: 1
Views: 3160

First consider statement (1) . It can be true even if a and b are of opposite signs. For example: a = 2 and b = -2 gives a^4 = b^4 a = 2 and b = 2. gives a^4 = b^4 You cannot be sure whether or not a and b have equal signs because raising to an even power will always be positive. Hence (1) is not s...

by Gmatbuddy

Tue Jul 26, 2016 11:19 pm
Forum: Data Sufficiency
Topic: For real numbers a and b, is it true that a = b?
Replies: 4
Views: 2278

You can simplify the question, making it easier to calculate or pick numbers.

by Gmatbuddy

Sat Jul 23, 2016 2:56 am
Forum: Data Sufficiency
Topic: DS
Replies: 4
Views: 2149

Fill in the gap type questions can be thought of as "Must be true" questions. This means that the correct answer choice must follow logically from the statement or "fit" the flow of the argument. If A had been " Lower the minimum qualifications an employee must have..." then it could have been a log...

by Gmatbuddy

Fri Jul 22, 2016 11:05 am
Forum: Critical Reasoning
Topic: GMAT PREP CR... why is A wrong?
Replies: 3
Views: 2773

The two important things to recognize are that:
1. The travel times will be equal when they meet.
2. A will have traveled 4.5 laps and B will therefore have traveled 3.5 laps because that is the first time they have met.

cheers.

by Gmatbuddy

Tue Jul 19, 2016 5:03 am
Forum: Problem Solving
Topic: Speed,Time,Distance; Difficulty: Hard; Circular Tracks
Replies: 3
Views: 2593

Derive as much information as you can out of the given data, and determine the value of n that will satisfy all the restraints.

by Gmatbuddy

Fri Jul 01, 2016 2:19 am
Forum: Problem Solving
Topic: OG2017- Mark and Ann together were allocated n boxes of cook
Replies: 3
Views: 2088