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

Math (PS)
6 students in a group study different languages as specified:
* Russian: 4
* Ukrainian: 3
* Hebrew: 2
Each student studies at least 1 language. If it is also known that exactly 3 students study exactly 2 languages, how many students are studying all three languages?
(A) 0
(B)...

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By dzyubam
- **Oct 12**, 02:00 AM

Math (PS)
How many five-digit numbers can be formed using the digits 0, 1, 2, 3, 4 and 5 which are divisible by 3, without repeating the digits?
(A) 15
(B) 96
(C) 120
(D) 181
(E) 216
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By dzyubam
- **Oct 11**, 02:00 AM

Math (PS)
One fisherman was telling his friends that he caught a fish that had a 60 foot long head. It also had a tail that was as long as the fish’s head and a half of its body. Finally, the body was half the size...

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By dzyubam
- **Oct 10**, 02:00 AM

Math (PS)
Which set(s) has the greatest standard deviation?
1. Set 1 consisting of 10 digits
2. Set 2 consisting of 10 first positive consecutive even numbers
3. Set 3 consisting of 10 first primes
(A) set 1
(B) set 2
(C) set 3
(D) set 1 and 2
(E) set 1, 2, and...

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

Math (DS)
Are integers , , and consecutive?
1. equals the arithmetic mean of and
2.
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By Knewton
- **Oct 6**, 13:23 PM

In last week’s post, I gave the following Data Sufficiency problem to be solved using a chart:
A certain zoo has 288 mammals, 25 percent of which are female. What percent of the mammals in the zoo were born at the zoo?
The number of male mammals...

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By dzyubam
- **Oct 6**, 02:00 AM

Math (PS)
A car dealership sold two cars: the first car at a 10% profit and the second car at a 10% loss, which gave them an overall profit margin of 5% from these two sales. If the dealership’s total profit was $1000, what was the...

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By dzyubam
- **Oct 5**, 02:00 AM

Math (DS)
Is a terminating decimal?
1.
2.
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