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190321
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\frac{5!+6!+7!}{6!+7!+8!} = ?
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190310
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A, B is independent events. The probability of occurrence of event a is 1/3, and that of event B is 1/2. What is the probability of at least one occurrence in A and B?
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190310
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Eight apples and three peaches cost twice as much as three apples and four peaches. What is the ratio of the price of a peach to that of an apple?
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190207
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It took 8 hours for a machine to finish 4/11 of the work. How many more 8 hours will it take to finish the rest of the work?
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191020
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After Tom walked from A to B, he decided to start going back. When he reached 10% of the whole journey,what fraction of the total round trip is the trip he has traveled?
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191020
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Susan drove 30 miles for the whole trip. It takes her car 15miles per gallon for the first 10 miles, and 45 miles per gallon for the remaining trip. What is the total oil consumption?
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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`s the variance of four numbers 9, 8, 7, 4?
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191222
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If two dice are flipped at the same time, what is the probability that "6" shows up at least once ?
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191222
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There are four objects marked 1, 2, 4, 7 in A pocket and other four objects marked 3, 5, 8, and 9 in B pocket. Let's take one object from A pocket and one from B. The probability of A >B is p, and the probability of A
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191222
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\frac { 1 \frac { 1 } { 2 } } { 1 \frac { 1 } { 5 } } = x \times \frac { 1 \frac { 1 } { 5 } } { 1 \frac { 1 } { 2 } }
,What is the value of x?
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200301
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The sequence a_1,a_2......a_n, such that a_1=3,a_2 = 5,a_3 = a_1 +a_2,a_4 = a_1+a_2+a_3,a_n=a_1+a_2+...+a_{n-1}. What is the ratio of a_{24} to a_{20}?
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190124 还原机经选题: 文字题&几何
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There are eight numbers in a sequence. The minimum value is 5 and the range is 9. What is the ratio of the difference between the maximum value and the minimum value of the average value of the sequence and the range of the sequence?
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190310 还原机经选题: 文字题&几何 730高分节-数学测试
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54x,y12 is a six digit number. x,y can be 3, 5, or 8. The value of x and y may be the same. What's the probability that the number can be divided by eight?
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191222
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Set A and set B has the same number of elements. The number of elements in Set C is the sum of 1/4 the number of elements in Set B and 1/3 the number of elements in Set A. What is the ratio of the number of elements in Set C to the number of elements in Set A?
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190603
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In the coordinate system, for a quadrilateral, the coordinates of four vertices are (1,0), (3,0), (3,1), (1,1) respectively. There is a straight line passing through the point (0,0) and divide the quadrilateral area into two equal parts. What is the slope of this straight line?
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181215
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S_1=1,S_2=2,S_3=2^{1}=2,S_n={S_{n-1}}^{S_{n-1}}.\frac{S_6}{S_5}=?
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OG18 OG19 OG20 OG2022
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 Each of the 12 squares shown is labeled x, y, v, or w. What is the ratio of the number of these squares labeled x or y to the number of these squares labeled v or w?
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OG18 OG19 OG20 OG2022
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Abdul, Barb, and Carlos all live on the same straight road, on which their school is also located. The school is halfway between Abdul`s house and Barb`s house. Barb`s house is halfway between the school and Carlos`s house. If the school is 4 miles from Carlos`s house, how many miles is Abdul`s house from Carlos`s house?
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A certain list consists of 21 different numbers. If n is in the list and n is 4 times the average (arithmetic mean) of the other 20 numbers in the list, then n is what fraction of the sum of the 21 numbers in the list?
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