By dzyubam
- **Jul 13**, 02:00 AM

Math (PS)
How many distinct integers are factors of 90?
(A) 6
(B) 8
(C) 9
(D) 10
(E) 12
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By Knewton
- **Jul 9**, 08:22 AM

Last week, I focused on rate problems involving speed (if you're looking to the answer to last week's challenge question, scroll down to the end of this post!). This week, I'm going to shift to work-rate problems, which some students find even more challenging. You...

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By dzyubam
- **Jul 7**, 02:00 AM

Math (PS)
At Daifu university, 40% of all students are both members of a student organization and want to reduce their tuition costs. 20% of those students who want to reduce tuition are not members of the student organization. What percentage of all Daifu students want...

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By dzyubam
- **Jul 4**, 02:00 AM

Math (PS)
If function satisfies for all , which of the following must be true?
(A)
(B)
(C)
(D)
(E)
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By dzyubam
- **Jul 1**, 02:00 AM

Math (PS)
How many odd three-digit integers greater than 800 are there such that all their digits are different?
(A) 40
(B) 56
(C) 72
(D) 81
(E) 104
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By dzyubam
- **Jun 30**, 02:00 AM

Math (PS)
If equation encloses a certain region on the coordinate plane, what is the area of this region?
(A) 20
(B) 50
(C) 100
(D) 200
(E) 400
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By dzyubam
- **Jun 29**, 02:00 AM

Math (PS)
Jack can complete the task in 8 hours. Tom can complete the task in 12 hours. If Jack works on the task alone for 4 hours and then Tom starts to help him, how many hours in total will Jack have worked by the...

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By dzyubam
- **Jun 24**, 03:30 AM

Math (PS)
How many integers between 18 and 70 inclusive are divisible by either 7 or 9 but not both?
(A) 11
(B) 12
(C) 13
(D) 14
(E) 15
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By dzyubam
- **Jun 23**, 02:00 AM

Math (PS)
After M students took the test, there was a total of 64% of correct answers. If the test contains 50 questions, what is the least number of questions that the next student have to get right to bring the total of correct answers to...

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By Knewton
- **Jun 21**, 09:41 AM

One of the most common areas of frustration for my GMAT students is rate problems. This seems a general extension of the challenges that word problems overall pose to students, but rate problems are particularly tricky. They require intensive setup and often rely on...

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