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题目： If $$9^{2x+5} = 27^{3x-10}$$, then x =

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题目： In a certain school, there are 160 boys and 240 girls. If 15 percent of the boys are left-handed and 25 percent of the girls are left-handed, what percent of the school's entire student population is left-handed?

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题目： What is 11% of x? (1) $$\frac{3}{8}$$ of x is 24(2) 5% of x is 3.2

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题目： The sequence $$a_1$$, $$a_2$$, $$a_3$$.....$$a_n$$...is such that $$a_n=\frac{a_{n-1}+a_{n-2}}{2}$$ for all $${n}\ge{3}$$. If $${a}_{3}$$=4 and $${a}_{5}$$ = 20, what is the value of $${a}_{6}$$ ?

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题目： If $${R}=\frac{P}{Q}$$ , is $$R\le P$$ ? (1) $$P > 50$$ (2) $$0 < Q \le 20$$

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题目： Data for a certain biology experiment are given in the table above. If the amount of bacteria present increased by the same fraction during each of the two 3-hour periods shown, how many grams of bacteria were present at 4:00 P.M.?

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题目： What is the remainder when the two-digit, positive integer x is divided by 3 ?(1)The sum of the digits of x is 5.(2)The remainder when x is divided by 9 is 5.

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题目： What is the value of a? (1) -(a + b) = 2a – b + 9 (2) a + b = 6

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题目： What was Bill's average speed on his trip of 250 miles from New York City to Boston? (1) The trip took Bill 5 hours.(2) At the midpoint of his trip, Bill was going exactly 50 miles per hour.

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题目： 8 cities, including Memphis, are finalists to be chosen to host a political convention. Exactly one city will be chosen to host the convention. What is the probability that Memphis is not chosen?(1) The probability that any one of the 8 cities does not win the competition is 7/8.(2) The probability that Memphis wins the competition is 1/8.

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题目： What percent of x is $$\frac{3}{4}$$?(1) x = 5y(2) y = 10

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题目： If Company X sold 6,000 newspapers last year, how many will it sell this year? (1) Two years ago, Company X sold 5,000 newspapers. (2) Three years ago, Company X sold 4,000 newspapers.

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题目： Is the positive integer x divisible by 6?(1) x is divisible by 12.(2) x is divisible by 9.

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题目： Bob works exactly 8 hours per day assembling widgets at a constant rate. How many widgets can he assemble in half of a workday?(1) Bob produces 20 widgets in a full workday.(2) Bob produces 50 widgets in 20 hours.

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题目： A certain box contains only red balls and green balls. If one ball is randomly selected from the box, what is the probability that it is red?(1) Red balls comprise exactly two-thirds of all the balls in the box.(2) The probability of selecting a green ball from the box is$$\frac{ 1}{3}$$.