By Jeff
- **May 10**, 02:00 AM

Math
If among 20 students in a group, 5 study math, 10 study physics, and 6 study chemistry, are there any students who do not study any of the above-mentioned subjects?
(1) There are no students studying all of the three subjects.
(2) None of those who study...

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By Jeff
- **May 9**, 02:00 AM

Math
A right cylindrical tank with radius of the base 1 and height 2 is half full of water. If all the water is poured into another cylinder tank with height 1 and radius of the base 2, to what percent of its capacity will this...

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By Jeff
- **May 6**, 02:00 AM

Math
There are three lamps in a hall. If each lamp can be switched on and off independently, in how many ways can the hall be illuminated? (The hall is illuminated when at least one of the lamps is on.)
A. 5
B. 6
C. 7
D. 8
E. 9
Question Discussion...

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By Jeff
- **May 5**, 02:00 AM

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By Jeff
- **May 4**, 02:00 AM

Math
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
Question Discussion & Explanation
Correct Answer - C - (click and drag your mouse to see the answer)
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By Jeff
- **May 3**, 02:00 AM

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By Jeff
- **May 2**, 02:00 AM

Math
= ?
A. -18
B. -16
C. -10
D. 14
E. 16
Question Discussion & Explanation
Correct Answer - A - (click and drag your mouse to see the answer)
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There's still...

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By Jeff
- **Apr 29**, 02:00 AM

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By Jeff
- **Apr 28**, 02:00 AM

Math
To arrive at its destination on time the bus should have maintained a speed of kilometers per hour throughout the journey. Instead, after going the first third of the distance at kilometers per hour, the bus increased its speed...

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By Jeff
- **Apr 27**, 02:00 AM

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