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190113 还原机经选题: 数论&代数	A and B are two-digit positive integers. The tens digit of A is 3. The unit digit of B is 5. A(B+1)=2016. 5A+2B=？
300难题	If each side of △ACD above has length 3 and if AB has length 1, what is the area of region BCDE?
191031	ABCE and AFCD are two rectangles, E is on FD, AB = 1, BC = 2, What is the area of rectangular AFDC.
OG19 OG20 OG2022	In the figure, the 6 small squares are identical, each with sides of length 1. What is the outer perimeter(shown in bold)of the entire figure?
OG12 OG15 OG16 OG17	Leona bought a 1-year, $10,000 certificate of deposit that paid interest at an annual rate of 8 percent compounded semiannually. What was the total amount of interest paid on this certificate at maturity?
OG19 OG20 OG2022	Ron is 4 inches taller than Amy ,and Barbara is 1 inch taller than Ron .If Barbara's height is 65 inches ,what is the median height ,in inches ,of these three people ?
OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022	For any positive integer n, the sum of the first n positive integers equals $$\frac{n(n+1)} 2$$. What is the sum of all the even integers between 99 and 301?
	How many seconds will it take for a car that is traveling at a constant rate of 45 miles per hour to travel a distance of 220 yards? (1 mile = 1,760 yards)
190215 还原机经选题: 数论&代数	There are two four digit abcd,dcba. 1 ≤ a, b, c, d ≤ 9. a,b,c,d are natural numbers and may be equal. What is the maximum value of abcd - dcba?
190124	x=3 - $$\sqrt{2}$$ is the solution of which of the following equations?
190124	Which of the following functions has no intersection with the x axis?
	If m = $$\frac{9}{25}$$,w = $$\frac{15}{32}$$, and m + w + c = 1, which of the following gives the values of m, w, and c in increasing order?
PREP07 Test 1	$$If m =\frac{9}{25}, w = \frac{15}{32}$$, and m + w + c = 1, which of the following gives the values of m, w, and c in increasing order?
Ready4	If $x < 0$ , which of the following statements must decrease as $x$ decreases? I. $10x-100$ II. $\frac{x-<font color='#FE8080'>1</font>}{x}$ III. $x^2-x$
Ready4	If $y < 0$ , which of the following must decrease as $y$ decreases? I. $10y-100$ II. $\frac{y-<font color='#FE8080'>1</font>}{y}$ III. $y^2-y$
Ready4	Daniel takes twice as long to wash $x$ dishes than Peter takes to wash the same amount of dishes. At these rates, if Daniel and Peter together wash $\frac{5}{4}x$ dishes in 3 hours, how many hours would it take Daniel alone to wash $\frac{<font color='#FE8080'>1</font>}{2}x$ dishes?
OG16 OG17 OG18 OG19 OG20 OG2022	If x and y are positive numbers such that x + y = 1, which of the following could be the value of 100x + 200y?I. 80II. 140III. 199
Ready4	For which of the following functions $g(x)$ is $g(x)=g(3-x)$ for all $x$ ?
Magoosh	If a truck is traveling at a constant rate of 90 kilometers per hour, how many seconds will it take the truck to travel a distance of 600 meters?(1 kilometer = 1000 meters)
	In 2012, there were 5 internet companies selling widgets worldwide. The graphic shows the monthly sales data for 2012 for two of those merchants as well as the worldwide average for widgets for those months. Based on the given information, use the drop-down menus to most accurately complete the following statements. A) WidgetMania and WidgetExpress accounted for more widgets sold than the other 3 internet companies for at least 1 month in 2012. B) In August 2012, the three widget merchants not specified on the graph sold a total of exactly widgets.