A certain solution that is 30 percent acid is obtained by mixing a-gallons of a 20 percent acid solution with y gallons of a 60 percent acid solution, where the percents are according to volume. How many gallons of the 60 percent acid solution must be used to obtain 10 gallons of the 30 percent add solution?
A. 0.75The range and standard deviation of the numbers In list Ware equal to /and s, respectively. What is the value of s?

The level of nitrates was measured and recorded for 10 water samples taken at the bottom of a certain lake and for 10 water samples taken at the surface of the same lake. Was the standard deviation of the measurements from the bottom samples greater than the standard deviation of the measurements from the surface samples?
(1)
The least of the measurements from the bottom samples exceeded the greatest of the measurements from the surface samples.
(2)
The range of the measurements from the bottom samples was greater than the range of the measurements from the surface samples.
A. Statement (1) ALONE is sufficient, but statement (2) atone is not sufficient.Is it true that the point (1,4) in the standard (x,y) coordinate plane is in at most one of the sets A and B?
(1)
Set AH the set of all points {x,y) such that 2x + y< 5.
(2)
Set 5is the set of all points (x,y) such that y > 3x+ 2.
A. Statement (1) ALONE is sufficient, but statement (2) atone is not sufficient.HOTSPOT Client: You've recommended that we use humor In our new radio advertising campaign. Why be funny on the radio when we haven't been funny in advertising campaigns for other media? Advertising director: Because humor on the radio is very engaging. Two other common approaches to radio advertising-using announcers and producing short catchy songs or jingles--are both so inherent In the existing radio programming
that commercials using those two approaches often get tost in the programs. Humor, on the other hand, Is rare--so rare it stands out and engages completely. The advertising director's argument depends on an assumption of cause and effect. Indicate by an appropriate selection which of the statements In the table most accurately describes the cause of such an effect, and which most accurately describes such an effect.
Make only two selection one in each column.
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When joni, Katrina, and Leah started their business, JKL Enterprises, each contributed an amount of money, in euros. The amounts were in the ratio of 3:5:8, respectively, and the first-year profit of JKL Enterprises was split in the same ratio. Katrina's share of the firstyear profit was 5,000. Select for First-year profit and for Leah's stare amounts In euros that are consistent with the given Information and could be the first-year profit of JKL Enterprises and Leah's share of those profits, respectively. Make only two selections, one in each column.
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Last year the amounts of electricity an electric company supplied to 4,117 residential properties and 2,504 commercial properties were recorded to the nearest thousand kilowatt-hours and summarized in the graph shown. The median of the amounts of electricity recorded is In which of the following categories?
A. 5-9
(1)
x= y
(2)
x < 1
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.In a stadium, 50 percent of all the seats were occupied 30 minutes before the start of a game, and 40 percent of the remaining seats were occupied by the start of the game. What percent of all the seats in the stadium were not occupied by the start of the game?
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