By dzyubam
- **Jul 18**, 02:00 AM

Math (PS)
If one of two parallel lines has 7 points on it and the other has 8, how many triangles can be drawn using the points?
(A) 168
(B) 196
(C) 316
(D) 364
(E) 455
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By Knewton
- **Jul 15**, 07:15 AM

This post was written by Rich Zwelling. For more GMAT prep tips, check out the Knewton GMAT blog.
I run the risk of sounding like a hypocrite here. I'm often fond of telling my students that the GMAT is a reasoning test, not a...

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

Math (PS)
A number of light bulbs were purchased to illuminate a gym. However, only of them were needed. The extra 160 light bulbs were returned. 60% percent of their cost, or $96, was reimbursed. How much money was spent on illuminating the gym?
(A) 360
(B)...

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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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