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190113
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x, y, and z are consecutive integers. 0 < x < y < z. Is xz even?
(1) xy is even.
(2) xyz is divisible by 4.
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190113
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The positive integers containing "2" are arranged in order from small to large. For example, 2, 12, 20, 21, 22, -. What's the 100th number?
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190113
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If positive integer k is larger than 1. Is $$\frac{k}{3}$$ an integer?
(1)$$\frac{12}{k}$$ is an integer.
(2)$$\frac{81}{k}$$ is an integer.
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190113 还原机经选题: 文字题&几何
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The total ride was 30 miles. What was the average speed?
(1) The average speed of the first 20 miles was 20 miles / h
(2) The average speed of the last 20 miles was 30 miles / h
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190113
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There are 50 balls in an opaque bag. The number of red balls, orange balls, yellow balls and green balls is 20, 20, 6, and 4, respectively. Two balls will be taken out randomly at one time from the bag. What's the approximate probability that the two balls are the same color?
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190113 还原机经选题: 文字题&几何
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There are books on the upper and lower floors of the bookshelf. The ratio of the number of books on the top floor to that on the bottom is 4 to 3. If 8 books are taken from the upper floor to the lower one, the ratio of the number of books on the top to that on the bottom will be 4 to 5. How many books on the upper floor at first?
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190113
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What`s the unit number of a positive integer n?
(1)The tens digit of $$11^{n}$$ is 4.
(2)The hundreds digit of $$5^{n}$$ is 6.
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190113
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If x, p, and q are positive integers, what`s the unit number of $$x^{pq}$$?
(1)$$x^{p}$$=1
(2)$$x^{q}$$=1
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190113 还原机经选题
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X=$$\frac{1}{2\sqrt{3}+\sqrt{7}}$$.X+$$\frac{1}{X}$$=?
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