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Machine $$X$$, working at a constant rate, can perform a job in $$T$$ hours. Machine $$Y$$, working at a different constant rate, can perform the same job in $$3T$$ hours. If the two machines work simultaneously at their respective constant rates, how many hours will it take for the machines to perform the job, in terms of $$T$$?


Quantity A

The area of triangular region XYZ

Quantity B

The area of triangular region KLM




Which of the following, if true, most strongly supports the argument?
In a group of 10 people, the median height is 70 inches, the average (arithmetic mean) height is 70.5 inches, and the range of the heights is 12 inches. If an additional person who is 74 inches tall joins the group, which of the three statistics must change?
Three different television models—$$K$$, $$N$$, and $$P$$—are for sale at a local store. The cost of model $$K$$ is $$20$$ percent greater than the cost of model $$N$$, and the cost of model $$N$$ is $$25$$ percent greater than the cost of model $$P$$. The cost of model $$K$$ is what percent greater than the cost of model $$P$$?
When positive integer $$m$$ is divided by $$6$$, the remainder is $$4$$. When positive integer $$p$$ is divided by $$6$$, the remainder is $$5$$. What is the remainder when the product $$mp$$ is divided by $$6$$?


In the figure above, $$\frac{x}{y}=\frac{2}{3}$$. What is the least number of degrees through which segment PR would have to be rotated in the direction indicated so that $$\frac{x}{y}=\frac{3}{2}$$
The results of the latest survey being ____________, earlier results gave researchers little relevant experience for the new data's interpretation.
The primary function of the highlighted sentence is to
The author implies that red fire ants in the United States differ from red fire ants in South America in the extent to which ants in the two environments
Tao Zhu and Yaobin Lu found that personality traits can affect user adoption of mobile commerce, suggesting that a mobile service provider could benefit from ____________ the market, specifically targeting extroverts, for instance.
A certain company made neither a profit nor a loss on the first 1,000 widgets it sold and made a profit of $0.50 on each widget it sold after the first 1,000. If the company's total profit from the sale of widgets was $$p$$ dollars, what is the number of widgets it sold, in terms of $$p$$?
A circular region with positive diameter $$d$$ has the same area as a square region with sides of length $$s$$.

Quantity A

$$d$$

Quantity B

$$s$$


If $$15 \leq r \leq 18$$ and $$30 \leq s \leq 36$$, what is the greatest possible value of the average (arithmetic mean) of $$\frac{1}{r}$$ and $$\frac{1}{s}$$?
In the xy -plane, the points (2, 7) and (8, 3) are the endpoints of a line segment that is the hypotenuse of a right triangle.

Quantity A

The x -coordinate of the vertex at the right angle of the triangle

Quantity B

The y -coordinate of the vertex at the right angle of the triangle


If N is a positive integer, then the number of prime numbers between N+1 and N+6, inclusive, CANNOT be
Machines A and B each assembled 3,000 metal clips in 15 hours and 12 hours, respectively, working alone at their constant rates. On Monday, working simultaneously at their respective constant rates, the two machines assembled a total of n clips in x hours. The next day, machine A was modified so that its constant rate decreased by 25 percent. If the two machines worked simultaneously at their respective constant rates for x hours after the modification of machine A, then the total number of clips that they assembled in x hours was approximately what percent less than it was the day before?
The average (arithmetic mean) and the median of a set of 5 numbers is 0, and the set contains at least one number that is not equal to 0. Which of the following statements must be true?
The median value for a sample of 7 numbers is 50.

The median value for a sample of 9 numbers is 52.

Quantity A

The median value for the combined sample of the 16 numbers

Quantity B

51




Some renewable energy technologies are quite ____________: for example, hydro power from dams and rivers has been a source of power generation since the early 1900s, and today it supplies sixteen percent of electricity worldwide.

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