问答题 If C=5r/(2s) and s≠0, what is the value of C? 　　(1) r=4s 　　(2) r=2/5

问答题 If a is an integer, is b an integer? 　　(1) The average (arithmetic mean) of a and b is an integer. 　　(2) The average (arithmetic mean) of a, b, and b+4 is a.

问答题 Kara attends a university where students study for an average (arithmetic mean) of 13.4 hours per week. How many hours per week does Kara study? 　　(1) The standard deviation of study time at Kara’s school is 2.8. 　　(2) Kara’s study time is one standard deviation away from the mean.

问答题 An employee at a company was given the task of making a large number of copies. He spent the first 45 minutes making copies at a constant rate on copier A, but copier A broke down before the task was completed. He then spent the next 30 minutes finishing the task on copier B, which also produced copies at a constant rate. How many total minutes would the task hare taken had copier A not broken down? 　　(1) Copier A produced twice as many copies in its first 5 minutes of operation as copier B produced in its first 15 minutes. 　　(2) Copier B produces 10 copies per minute.

问答题 If x and y are both positive numbers, is x greater than 75 percent of y? 　　(1) 5x>4y+1 　　(2) x=6

问答题 N and P are points on the number line below 20. Is P closer to10 than N is? 　 (1) P is greater than the average of 10 and N 　 (2)