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191031
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If the straight line l passes through the origin, and (a,b) is a point on the straight line l, then is a>0?
(1)b-a>0
(2) the slope of straight line l is less than 0
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191031
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If |nx-8|≤4, then how many positive integers n that can make x exactly have two different integer solutions?
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191031
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If $$xa^4+yb^3=5$$,then x+y=?
(1)$$xa^4 =x$$
(2) $$yb^3 = y$$
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191031
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The dimensions of a rectangular container which is filled up with water are 6.5cm by 8cm by 12.5cm. Pour the water into a cylindrical container with a bottom diameter of 10cm. The height of the water is 2/3 of the height of the cylinder. What is the height of the cylinder?
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191031
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A company's revenue in 2002 was 20% higher than that in 2001, and its revenue in 2003 was 25% lower than that in 2002, while its cost in 2002 was 20% lower than that in 2001, and its cost in 2003 was 30% higher than that in 2002. Assuming that the profit of this company in 2001, 2002 and 2003 are X, Y and Z respectively, what is the correct order of X, Y and Z?
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191031
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Of the 60 cars at a certain store, 20 cars have sunroof, 30 cars have windshield. How many cars have both sunroof and windshield?
(1)15 cars have neither sunroof nor windshield
(2)40 cars have either only sunroof or only windshield
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191031
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If the remainder of x/y is 3, can x be divided by 3?
(1)y=6
(2)x
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191031
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Fill the pool with 10000cm3 of water. It will take 8 hours for A alone to complete the task, and if AB can work together, it will take 6 hours. What is the rate of B working alone?
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191031
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In the sequence an, if $$a_n=a_{n-1}+-+a_{1}$$ for all positive integers n≥2, and $$a_n=P$$, what is the value of $$ a_{n+2}$$ in terms of p?
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191031
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If $$y = x^2+mx+n$$ has two roots , namely 1 and 2, what`s the value of m - n ?
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191031
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If $$ a_1$$=2,$$a_2$$=3,$$a_3$$=5,and each of the items after $$a_3$$ is the twice of the previous item, what`s the value of $$\frac{a_{24}}{a_{20}}$$?
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191031
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Is the y-coordinate of the intersection of a parabola and the y-axis greater than 0?
(1)The intersection with the X-axis is -3 and 5
(2)The maximum value is 12
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191031
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A and B are 5miles apart, C and D are 7miles apart. The average speed of a car passing through AB is X miles/h, and the average speed of passing through CD is Y miles/h. Does it take more hours for the car to pass through AB than to pass through CD?
(1)y = x+20
(2)y<2x
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191031
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A meeting lasts 7 days at a time. It starts at Friday, and it will not be held on weekends. There are 18 meetings in total. What day is the end of the 18th meeting?
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191031
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There are two kinds of pencils, one kind of pencil is 30 cents each, and the other kind of pencil is 24 cents each. How many pencils of 30 cents are bought?
(1). Two kinds of pencils cost 102 cents in total
(2). The number of pencils priced at 30 cents is five times the number of pencils at 24 cents
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191031
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The speed of a person driving to the airport is 60km / h. After arriving at the airport, the speed of the plane is 600km / h. The driving time is twice as long as the flight time. The total distance traveled by this person is 2160km. How long did he spend?
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191031
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How many of these x that make the median and average of x, 1, 2, 3, 4 equal?
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191031
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n is a two-digit number, 30≤n≤80, is the single digit of n equal to 2?
(1). Both single and tens digits are prime numbers
(2). The sum of N`s tens digit and units digit is a prime number
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191031
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4410= k√m,what is the least possible value of m?
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191031
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Five numbers v,w,x,y,z. Is the median of the five numbers equal to its mean?
(1). v < w < x < y < z
(2). w-v = x-w = y-x = z-y
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