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190215 x > 0.y,z < 0.$$(|x|+|y|+|z|)^{2}$$=?
190215 x > 0,y < 0,z > 0.$$|x+y+z|^{2}$$=?
Ready4

If and , which of the following must be true?
PREP07 Test 1 Three grades of milk are 1 percent, 2 percent, and 3 percent fat by volume. If x gallons of the 1 percent grade, y gallons of the 2 percent grade, and z gallons of the 3 percent grade are mixed to give x + y + z gallons of a 1.5 percent grade, what is x in terms of y and z ?
OG18-定量推理 GMAT、gmat题库、gmat模考、gmat考满分If the variables X, Y, and Z take on only the values 10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median?
OG19-数学分册 If the variables, X, Y, and Z take on only the values 10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median?
Ready4

If  and , then which of the following must be true?
Manhattan Machine A, working alone at a constant rate, can complete a certain production lot in x hours. Machine B, working alone at a constant rate, can complete 1/5 of the same production lot in y hours. Machines A and B, working together, can complete$$ \frac{1}{2}$$ of the same production lot in z hours. What is the value of y in terms of x and z?
PREP07 Test 1 GMAT、gmat题库、gmat模考、gmat考满分The figure shows seven train stations and the distances, in miles, along the railways that connect these stations. Beginning at one of the stations, a train takes 25 hours to travel directly to station W at an average rate of 50 miles per hour. At which of the stations did the train begin?
If x, y, and z are integers and (x + y)(y)(z) is odd, which of the following must be odd?
Ready4 If x, y, and z are positive integers such that x is a factor of y, and x is a multiple of z, which of the following is NOT necessarily an integer?
200301 If x is p% higher than y and y is r% lower than z, what`s the value of x in terms of p and r?
PREP07 Test 2 GMAT、gmat题库、gmat模考、gmat考满分For the numbers on the number line above, which of the following statements is true?
Magoosh The Z-300 is a particularly fast new sports car, popular among young drivers. It is an expensive model, and relatively few are on the roads. Two months ago, seven different young people in Catoville were arrested for operating the Z-300 at excessive speeds on local roads while having a blood alcohol level well above the legal limit. Since then, a police watch group has reported that Catoville traffic cops frequently have been pulling over drivers of the Z-300 and testing them for alcohol: the total number of Z-300 drivers stopped and tested is five times greater than the total number of drivers of all other makes or models stopped and tested. Which of following conclusions can most properly be drawn from the information above?
190302 -x+y+z = -10, -x-y+z = -10, -x+y-z = -10. x+y+z =?
The operation $$\Theta$$ is defined by $${x}\Theta{y}=\frac{1}{x}+\frac{1}{y}$$ for all nonzero numbers x and y. If z is a number greater than 1, which of the following must be true? I. $$z\Theta(-z) = 0$$II.$${z}\Theta{\frac{z}{z-1}}={1}$$III. $$(\frac{2}{z})\Theta(\frac{2}{z})={z}$$
OG20 OG2022 Is the average (arithmetic mean) of the numbers x, y, and z greater than z ? 1.z – x < y – z 2.x < z < y
PREP07 Test 2 Is $$y<{(x+z)\over2}$$ ?(1) y - x < z - y(2) $$z - y <{ (z-x)\over2}$$
Ready4

Is an integer?

(1)

(2)

PREP07 Test 2 If w and z are positive, is$$\frac{w}{z}$$ < 1 ?(1) w < z(2) z < 4