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190302
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-x+y+z = -10, -x-y+z = -10, -x+y-z = -10. x+y+z =？
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190302
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What is the range of {3,7,8,x,12,y}?
1: The average of {3,7,8,x,12,y} is 7.5.
2: 3
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190302
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x,y,z are positive integers. x+y+z=?
1：xyz=251
2：x-y-z=0
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191031
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Tom converts x euros to some dollars. The bank converts his euros to dollars firstly, and then charge 4% commissions. If Tom gets 1830 dollars finally, what is the value of x？
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191031
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In the figure, a square is inscribed with a regular octagon. The length of the side of this regular octagon is 2. How much larger is the area of this square than that of this regular octagon?
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191031
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A wall is painted with at least one of six different colors-red, yellow, blue, green, pink, and white. How many ways can white be used?
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191031
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According to the table, what is the median?
(1)4≤y≤7
(2)1≤y≤4
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191031
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There are n different books in a shelf. What is the value of n?
(1)There are only two books of mathematics, and if these two different mathematics books are adjacent, the arrangements of these n books are 240.
(2)If two books are selected randomly from the shelf, there are 15 different combinations.
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191031
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The ratio of zinc to copper in X is 5:7, and the ratio of zinc to copper in Y is 8:7. Mix the equal amount of X and Y to produce a new mixture of Z. What is the ratio of zinc to copper in Z ?
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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 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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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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4410= k√m，what is the least possible value of m?
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191031
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Two alcohol solutions, the ratio of alcohol to water in one alcohol solution is 5 to 2, and the ratio of alcohol to water in the other alcohol solution is 3 to 2. Now the two solutions (each 35 liters) are mixed together. What's the ratio of alcohol to water in the new solution?
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191031
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What is the area of a right triangle?
(1). The perimeter of the triangle is 20cm
(2). The shortest side of the triangle is 5cm
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191031
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n is an integer greater than 1, and T is the set of multiples of all integers n, such as T = {n, 2n, 3n ...}. What's the value of n?
(1). 7 belongs to T
(2). 49 belongs to T
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191020
|
P and q are two prime numbers, how many factors does pqⁿ have?
(1)p = 3, q=7
(2)n = 2
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191020
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p,q are both integers, what is the value of p-q/p+q?
(1). p/q = 11/9
(2). p^2-q^2/(p-q)^2 = 10
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191020
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|x-2|=2x-10，what is the possible value of x?
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