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OG18-数学分册 A total of 20 amounts are entered on a spreadsheet that has 5 rows and 4 columns; each of the 20 positions in the spreadsheet contains one amount. The average (arithmetic mean) of the amounts in row i is $${R}_{i}$$ $$(1 \leq i \leq 5)$$. The average of the amounts in column j is Cj $$(1 \leq j \leq 4)$$. What is the average of all 20 amounts on the spreadsheet?(1) $${R}_{1}+{R}_{2}+{R}_{3}+{R}_{4}+{R}_{5}={550}$$(2) $${C}_{1}+{C}_{2}+{C}_{3}+{C}_{4}={440}$$
In the xy-plane, line a and line b have the same slope. If the y-intercept of line a is –1, what is the y-intercept of line b ? (1) The x-intercept of line a is –1.(2) Line b passes through the point (10, 20).
OG16 OG17 OG18 OG19 OG20 OG2022 At the start of an experiment, a certain population consisted of 3 animals. At the end of each month after the start of the experiment, the population size was double its size at the beginning of that month. Which of the following represents the population size at the end of 10 months?
The sequence $${a}_{1}$$, $${a}_{2}$$, ..., $${a}_{n}$$, ... is such that $${a}_{n}=4a_{n-1}-{3}$$ for all integers $$n > 1$$. If $${a}_{3}={x}$$, then $${a}_{1}$$ =
Of the 60 animals on a certain farm, $$\frac{2}{3}$$ are either pigs or cows. How many of the animals are cows?(1) The farm has more than twice as many cows as it has pigs.(2) The farm has more than 12 pigs.
A store purchased a Brand C computer for the same amount that it paid for a Brand D computer and then sold them both at higher prices. The store's gross profit on the Brand C computer was what percent greater than its gross profit on the Brand D computer?(1) The price at which the store sold the Brand C computer was 15 percent greater than the price at which the store sold the Brand D computer.(2) The store's gross profit on the Brand D computer was $300.
Is $${h}^{2}={h}$$ ?(1) h + h = h(2) h - h = h
What is the value of x?(1) $$\mid{x+2}\mid \leq 4$$(2) $${x}^{2}=36$$
For a week Raymond is paid at the rate of x dollars per hour for the first 40 hours he works and y dollars per hour for the hours worked in excess of 40 hours. What is the value of y?(1) If Raymond works 46 hours in one week, he will earn $416.50.(2) Raymond's hourly rate for the hours worked in excess of 40 hours per week is 1.5 times his hourly rate for the first 40 hours.
If r and t are positive integers, what is the value of t?(1) $${t}^{r-1}={1}$$(2) $$r \neq 1$$
Is m between 35 and 75 ?(1) m is between 40 and 80.(2) m is between 50 and 90.
If k is a positive integer, what is the remainder when $${2}^{k}$$ is divided by 10 ?(1) k is divisible by 10.(2) k is divisible by 4.
Is |k| = 2 ?(1) $$k^{2}=4$$(2) k = |-2|
Is x greater than y ? (1) $${x}-{y}^{2} >{0}$$ (2) xy <0
OG17 Was the average (arithmetic mean) weight of the package mailed at a certain post office yesterday greater than 600 grams?(1) The total weight of the packages mailed at the post office yesterday was greater than 14,500 grams.(2) Fewer than 25 packages were mailed at the post office yesterday.
GMAT、gmat题库、gmat模考、gmat考满分 In the figure shown, line segments QS and RT are diameters of the circle. If the distance between Q and R is $$\frac{8}{\sqrt{2}}$$ , what is the area of the circle?
Does the decimal equivalent of $$\frac{p}{q}$$, where p and q are positive integers, contain only a finite number of nonzero digits?(1) p > q (2) q = 8
If 2, x, y, and z are different positive integers whose average (arithmetic mean) is 10, what is the greatest possible value of z ?
If –2x > 3y, is x negative?(1) y > 0(2) 2x + 5y – 20 = 0
Jacob purchased 100 boxes of oranges at $8.00 per box. He sold 8 of the boxes at $4.00 per box to Company A, and he sold the rest of the boxes at x dollars per box to Company B. If Jacob's profit from the purchase and sale of the 100 boxes of oranges was $336.00, at what price per box did he sell the boxes to Company B ?