By dzyubam
- **Jun 28**, 03:45 AM

Math (DS)
grams of water were added to the 80 grams of a strong solution of acid. As a result, the concentration of acid in the solution became times of the initial concentration. What was the concentration of acid in the original solution?
...

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By dzyubam
- **Jun 27**, 02:00 AM

Math (DS)
A rectangle is inscribed in a circle of radius 5. Is the area of the rectangle bigger than 48 ?
1. The ratio of the lengths of sides of the rectangle is 3:4
2. The difference between the lengths of sides of the rectangle is smaller...

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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 dzyubam
- **Jun 22**, 02:00 AM

Math (PS)
How many three-digit integers are not divisible by 3 ?
(A) 599
(B) 600
(C) 601
(D) 602
(E) 603
OA and Explanation
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By dzyubam
- **Jun 21**, 02:00 AM

Math (PS)
If 10 dollars are equivalent to 24 francs and 12 pounds are equivalent to 36 francs, what is the pound equivalent of 95 dollars?
(A) 58
(B) 64
(C) 68
(D) 76
(E) 82
OA and Explanation
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By dzyubam
- **Jun 20**, 02:00 AM

Math (DS)
If points , , , and form a quadrilateral, is longer than ?
1.
2.
OA and Explanation
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By dzyubam
- **Jun 17**, 02:00 AM

Math (PS)
If a certain soccer game ended 3:2, what is the probability that the side that lost scored first?
(Assume that all scoring scenarios are equiprobable)
(A)
(B)
(C)
(D)
(E)
OA and Explanation
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By dzyubam
- **Jun 16**, 02:00 AM

Math (PS)
If curves and enclose a sector on the top part of XY-plane, what is the area of this sector?
(A)
(B)
(C)
(D)
(E)
OA and Explanation
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By dzyubam
- **Jun 15**, 02:00 AM

Math (DS)
If , what is ?
1. is an integer
2. is an integer
OA and Explanation
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