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Magoosh
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The ratio of two positive numbers is 3 to 4. If k is added to each number the new ratio will be 4 to 5, and the sum of the numbers will be 117. What is the value of k?
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OG18-数学分册
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A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
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OG19-数学分册
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A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
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Ready4
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A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have exactly 2 girls and 2 boys?
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Magoosh
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If the ratio of the volume of cube A to the volume of cube B is 1 to 8, what is the ratio of the surface area of cube A to the surface area of cube B?
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190124 还原机经选题: 文字题&几何
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The distance between the point (x,0) and (-1,3) equals to that between (x,0) and (8,4). x=?
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OG18-数学分册
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If x and y are integers such that $$2 < x \le 8$$ and $$2 < y \le 9$$, what is the maximum value of $$\frac{1}{x} - \frac{x}{y}$$?
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OG19-数学分册
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What is the ratio of c to d?
(1) The ratio of 3c to 3d is 3 to 4.
(2) The ratio of $$c + 3$$ to $$d + 3$$ is 4 to 5.
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Ready4
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If the product of integer  and integer  is odd, then which of the following must be even?
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Ready4
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Set  contains the elements  . Which of the following sets has a smaller standard deviation than set ?
I. 
II. 
III. 
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PREP07 Test 2
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Which of the following is equal to the average (arithmetic mean) of $$(x + 2)^2$$ and $$(x - 2)^2$$ ?
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191031
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In the figure above, what is the value of (R50, C3) ?
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2, 4, 6, 8, n, 3, 5, 7, 9In the list above, if n is an integer between l and 10, inclusive, then the median must be
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300难题
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If there is a least integer that satisfies the inequality$$\frac{9}{x} \geq 2$$,what is that least integer?
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Magoosh
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$$(1\frac{4}{5})^{2}$$=
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190215
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$$\frac{0.8^{-5}}{0.4^{-4}}$$=?
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Magoosh
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If 0.25 + x = y and y/x = 0.2, then y =
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OG20 OG2022
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What is the remainder when the positive integer n is divided by 5 ?
1.When n is divided by 3, the quotient is 4 and the remainder is 1.
2.When n is divided by 4, the remainder is 1.
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OG15 OG16 OG17 OG18 OG19 OG20
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Is the positive two-digit integer N less than 40 ?(1) The units digit of N is 6 more than the tens digit(2) N is 4 less than 4 times the units digit.
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OG19-数学分册
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If m and n are positive integers, ism+ n divisible by 4?
(1) m and n are each divisible by 2.
(2) Neither m nor n is divisible by 4.
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