来源：

题目： If y is 80 percent greater than x, then x is what percent less than y?

来源：

题目： If $$8^{c}*\sqrt{8}={8^{a}\over8^{b}}$$ then a=?

来源：

题目： If 5x - 3y = 7 and 2y - 4x = 3, then 2x - 2y =

来源：

题目： If xy = 5 and $$x^{2} + y^{2} = 12$$, then$$ \frac{x}{y} + \frac{y}{x} $$=

来源：

题目： After receiving a 25% discount, Sue paid $180 for a lawnmower. What is the original price of the lawnmower before the discount?

来源：

题目： If the sales tax on a $12.00 purchase is $0.66, what is the sales tax on a $20.00 purchase?

来源：

题目： A box contains 6 black balls and 4 white balls. If two balls are selected at random without replacement, what is the probability that both balls are white?

来源：

题目： If 24 kilograms of flour are required to make 300 tarts, how many kilograms of flour are required to make 45 tarts?

来源：

题目： If the sum of three consecutive integers is K , then which of the following is a possible value of K?

来源：

题目： $${159,919}\over{(409)(17)}$$=

来源：

题目： If ABCD is a square, what are the coordinates of C?

来源：

题目： In the figure, JKLMNP is a regular hexagon. Find the measure of ∠MQN.

来源：

题目： A purse contains 5-cent coins and 10-cent coins worth a total of $1.75. If the 5-cent coins were replaced with 10-cent coins and the 10-cent coins were replaced with 5-cent coins, the coins would be worth a total of $2.15. How many coins are in the purse?

来源：

题目： Working together, 7 identical pumps can empty a pool in 6 hours. How many hours will it take 4 pumps to empty the same pool?

来源：

题目： If 2 ÷ 2 ÷ 2 ÷ 2 ÷ 2 = $$2^{x}$$, then x =