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190113
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A driver originally drove at a constant speed of 17 miles/h. Then, he increased the speed and continued to drive at a constant speed. How much more time can he save if he drove 255 miles at the increased speed than at original speed?
(1)It took 2.5h to drive 255 miles at the increased speed.
(2)He drove for 4 hours at the original speed.
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190113
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$$a_n$$=$$a_n$$-2+11（n > 3）. Does the number 633 belongs to the number series {$$a_n$$}?
(1)$$a_1$$=28
(2)$$a_2$$=30
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190113
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Is the average of r, s, and t equal to their median?
(1) The average of r, s, and t is s.
(2) r < s < t
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190603
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E, J, R and V take an exam and the total score of these four people is 400. What is the relationship between the score of J and the score of R?
(1) E+J=R+V+100
(2) E+R=J+V-80
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190113
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Is x a negative number?
(1) $$x^{3}$$ < $$x^{2}$$
(2) $$x^{3}$$ < $$x^{4}$$
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190113
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An opaque bag contains 50 balls in only two colors, red and white. Remove 2 balls from the bag one by one without replacement. What is the total number of white balls in the bag?
(1)The probability of taking out the white ball for the first time is $$\frac{1}{5}$$.
(2)The probability that the ball taken out are both red is $$\frac{156}{245}$$.
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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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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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x=a$$\sqrt{b}$$, y=c$$\sqrt{d}$$. If a, b, c and d are positive integers, and x and y are not integers. Is xy an integer?
(1) $$\sqrt{ad}$$ is an integer.
(2) $$\sqrt{bc}$$ is an integer.
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190113 还原机经选题: 文字题&几何
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Bob invests $1000 in two investments, A and B, whose simple interest rates are 6% and 8%, respectively. If Bob invests them for both 1 year, how much does he invest in investment A?
(1) The total interest he gets is $74.
(2) The interest of A is $38 less than that of B.
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190113
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If x+y=z, what is the value of y?
(1)y=x+z
(2)x=y+z
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190113
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A sequence contains 11 numbers. Is the median of the sequence greater than 50?
(1) Only 5 numbers are less than 49.
(2) Only 5 numbers are greater than 49.
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190113 还原机经选题: 文字题&几何
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What is the total length of the 10 vertical lines?
(1) a = 2
(2) b = 3
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190113
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According to the picture, the length, width, and height of a cuboid ABCDEFGH are a, b, and c, respectively. The cuboid is grounded with the surfaces as shown in figure (1) (2) and is filled with equal volume of water with height of x and y respectively. y/b=?
(1)7x=10c
(2)x=9
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190113
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According to the picture, AB=10. O is the center of this circle, and AB is the diameter of the circle O. AC=?
(1)AC+BC=14
(2)BC:AB=3:5
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190124
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Is the average of the sequence greater than the median?
1: 60% of the number in the sequence is less than the average.
2: The average of the sequence is greater than the average of the minimum and maximum.
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190124
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Is a even?
1：$$a^{b}$$+b is even.
2：$$b^{a}$$+a is even.
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190124
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There are 10 numbers in a set. What is the median of these 10 numbers?
1: The average is 5.
2: The range is 14
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190124
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$$y_1$$=$$x^{2}$$-3,$$y_2$$=2x+5,is $$y_1$$ > $$y_2$$ ?
1：x > -2
2：x < 4
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190321
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Quadrilateral ABCD is a rectangle. AD=20, AM=DN, BP=QC. PQ=?
1：BP+QC=MN
2：AM+ND=PQ
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