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Is x a factor of 24?
1: 3x is a factor of 48.
2: 5x is a factor of 60.
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n=？
1: The greatest common factor for n and 12 is 4.
2: The least common multiple of n and 12 is 60.
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The average speed of someone walking from A to B was 8 miles/h. He walked slower when he went back. How far did this man walk in all?
1: The man ran for 1 hour and 25 minutes.
2: The average speed of going back was 75% of that of walking from A to B.
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9$$x^{2}$$-4$$y^{2}$$=189. x=？
1：3x+2y=21
2：3x-2y=9
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n is a positive integer. The product of the hundreds digit, the tens digit, and the unit digit is 54. What is the unit digit of n?
1: n > 950
2: The sum of the hundreds digit, the tens digit, and the unit digit is 16.
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Both a,b are positive integers. $$\sqrt{a+b}$$=？
1：$$(a+b)^{2}$$=40
2：$$\sqrt{a}$$+$$\sqrt{b}$$=6
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∠ADB=90°, AD is radius, AD = 5cm. What is the area of the shadow?
1：∠BAC=15°
2：∠CAD=30°
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The sum of three positive integers is even. Is the product of these three numbers a multiple of 4?
1: The three numbers are equal.
2: The three numbers are even.
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A retail store bought 120 items and the unit price was x. The first 100 items were sold at the price of y, and the selling price of the last 20 items was 20% more than the cost of each item. What's the profit from selling these 120 goods?
1: The selling price of the first 100 pieces was 30% more than the cost of each item.
2: The selling price of the first 100 pieces was 20 dollars more than that of the last 20 pieces.
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There are n books on the shelf. n=?
1: There are 240 ways to arrange the books when two math books are adjacent.
2: There are 15 ways to select two books from all of the books in the shelf.
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$$3^{xy}$$=?
1：$$5^{x}$$=$$11^{y}$$
2：$$3^{x}$$=$$9^{y}$$
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The adajecent lines are perpendicular to each other, as shown in the picture. AB=?
1：x=2
2：y=3
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Does the parabola y=$$x^{2}$$+c intersect with the line y=mx+b?
1：c-b<0
2：$$m^{2}$$-4(c-b) ≥ 0
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Does the equation 2$$x^{2}$$ + bx + 8=0 have real solutions?
1：b < 0
2：$$\frac{b-9}{b+10}$$ >0
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Is $$x^{2}$$ > $$y^{2}$$ ?
条件1：x > y
条件2：$$x^{3}$$ > $$y^{5}$$
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S = {1,2,3,4,5}, A,B are subsets of S, Ac, Bc represent the sets belonging to S but not belonging to A,B respectively. Ac∩B=？
1: A∩B={2}
2: A∩Bc={4}
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x is a positive integer. Is $$x^{2}$$+3x+45 divisible by 9?
1: is divisible by 3.
2: is divisible by 225.
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The total weight of seven boxes of different weights is known. What is the median weight of these seven boxes?
1: The average weight of the four lightest cases is given.
2: The total weight of the four heaviest boxes is known.
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In parallelogram ABCD, AB=AD. AC=？
1：BD=2
2：AB=2
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In the parallelogram ABCD, AB = 8. What is the area of this parallelogram?
1：∠DAB=150°
2：BC=12
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