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181215
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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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181215
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9$$x^{2}$$-4$$y^{2}$$=189. x=？
1：3x+2y=21
2：3x-2y=9
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181215
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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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181215
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Both J and A have some stamps. The ratio of the total number of stamps of J to that of A is 5:3. The total amount of J's stamps is 50 more than 5/9 of two people's stamps. How many stamps do A have?
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181215
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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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181215
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There are five students and five chairs in a row in the classroom. Jason and Kate are required to sit in the middle chair. How many different arrangements are there?
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181215
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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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181215
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$$r_{n+1}$$ - $$r_n$$=$$\frac{(-1)^{n}}{2^{n}}$$, what is the relationship of $$r_1$$,$$r_2$$,$$r_3$$？
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181215
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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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181215
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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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181215
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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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181215
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Coffee cups were put in two size of boxes. A big box and a small box can hold 15 coffee cups. Two big boxes and four small boxes can hold 40 coffee cups. How many coffee cups can be put in a big box?
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181215
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$$3^{xy}$$=?
1：$$5^{x}$$=$$11^{y}$$
2：$$3^{x}$$=$$9^{y}$$
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181215
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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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181215
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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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181215
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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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181215
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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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181215
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Which of the following options is NOT satisfied that the remainder of the option divided by 7 equals the remainder of the option divided by 5?
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181215
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The lengths of the three sides of isosceles triangle are t-6, t-4, and 2t-20. Which of the following may be the perimeter of the triangle?
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181215 KMFPS
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A positive integer has a remainder of 5 when divided by 10 and a remainder of 3 when divided by 8. What is the general formula for this number?
(Note: k is a natural number.)
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