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题目： Solution X is 10 percent alcohol by volume, and solution Y is 30 percent alcohol by volume. How many milliliters of solution Y must be added to 200 milliliters of solution X to create a solution that is 25 percent alcohol by volume?

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题目： The entire contents of a full sack of flour can be used to make 15 cupcakes and 8 pizzas. The same full sack of flour can be used to make 7 cupcakes and 14 pizzas. If a full sack of flour is used to make only pizzas, how many pizzas can be made?

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题目： The nth term$$(t_n)$$ of a certain sequence is defined as $$t_n = t_{n-1} + 4$$. If$$ t_1= -7 $$then $$t_{71}$$ =

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题目： If $$x \neq$$ 2.5 and 2x = |15 - 4x|, then x =

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题目： If x is a number such that $$x^2 + 2x - 24 = 0 and x^{2} + 5x - 6 = 0$$, then x =

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题目： A certain restaurant offers 8 different salads, 5 different main courses, 6 different desserts. If customers choose one salad, one main course and two different desserts for their meal, how many different meals are possible?

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题目： David drove to work at an average (arithmetic mean) speed of 45 miles per hour. After work, David drove home at an average speed of 60 miles per hour. If David spent a total of 2 hours commuting to and from work, how many miles does David drive to work?

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题目： What is the average (arithmetic mean) of all multiples of 10 from 10 to 400 inclusive?

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题目： If the hypotenuse of an isosceles right triangle has length of 8, then the area of the triangle is

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题目： x is betweenNote: Figure not drawn to scale

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题目： What is the remainder when$$ 43^{86}$$ is divided by 5?

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题目： What is the units digit of $$18^{47}$$?

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题目： If $$4^{n} + 4^{n} + 4^{n} + 4^{n} = 4^{16}$$ , then n =

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题目： Every person in a certain group is either a Dodgers fan or a Yankees fan, but not both. The ratio of Yankees fans to Dodgers fans is 5 to 3. If 22 Yankees fans change teams to become Dodgers fans, the ratio of Dodgers fans to Yankees fans will be 1 to 1. How many people are in the group?

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题目： If $$72^{4}$$ is the greatest common divisor of positive integers A and B, and $$72^{6} $$is the least common multiple of A and B, then AB=