By Knewton
- **Oct 24**, 09:00 AM

Here's another quick tip for those of you still struggling with the pitfalls of Data Sufficiency.
Let's take a look at the following Official Guide DS problem:
If p and q are positive integers and pq = 24, what is the value of p?
(1) q/6 is...

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By dzyubam
- **Oct 24**, 02:00 AM

Math (PS)
John has 12 clients and he wants to use color coding to identify each client. If either a single color or a pair of two different colors can represent a client code, what is the minimum number of colors needed for the coding? Assume...

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By dzyubam
- **Oct 21**, 02:00 AM

Math (DS)
Is an integer?
1.
2.
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By Knewton
- **Oct 20**, 13:41 PM

This GMAT prep post was written by Rich Zwelling.
Who cares?" That should be the operative question on your mind as you tackle Data Sufficiency problems.
Here's what I mean: Suppose I ask you the question "What is x?" I then give you a statement that says...

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By dzyubam
- **Oct 20**, 02:00 AM

Math (PS)
A perfect number is defined as one for which the sum of all the unique factors less the number itself equals to the number. For instance, 6 is a perfect number, because the factors of 6 (apart from 6 itself) are 1, 2 and...

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By dzyubam
- **Oct 19**, 02:00 AM

Math (DS)
Is ?
1.
2.
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By dzyubam
- **Oct 18**, 02:00 AM

Math (DS)
Is integer odd?
1. is odd
2. is odd
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By dzyubam
- **Oct 17**, 02:00 AM

Math (PS)
A soccer coach riding his bike at 24 km/h reaches his office 5 minutes late. Had he traveled 25% faster, he would have reached the office 4 minutes earlier than the scheduled time. How far is his office from his house?
(A) 18 km
(B) 24...

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By Knewton
- **Oct 14**, 13:35 PM

When discussing fractions, I often find a very interesting area of confusion among students. I'll ask them to compare, for example, 1/3 and 1/4. Almost everyone correctly answers that 1/4 is smaller. "How do you know?" I'll ask. And this is where...

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By dzyubam
- **Oct 14**, 02:00 AM

Math (PS)
What is the last digit of the following number ?
(A) 6
(B) 5
(C) 2
(D) 1
(E) 0
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