Is x - y + 1 greater than x + y - 1 ?

(1) x > 0
(2) y < 0

If wx = y, what is the value of xy ?

(1) wx² = 16
(2) y = 4

If the average (arithmetic mean) of four different numbers is 30, how many of the numbers are greater than 30 ?

(1) None of the four numbers is greater than 60.
(2) Two of the four numbers are 9 and 10, respectively.

A construction company was paid a total of $500,000 for a construction project. The company's only costs for the project were for labor and materials. Was the company's profit for the project greater than $150,000 ?

(1) The company's total cost was three times its cost for materials.
(2) The company's profit was greater than its cost for labor.

Does x + y = 5 ?

(1) 4x + y = 17
(2) x + 4y = 8

Is m ≠ n ?

(1) m + n < 0
(2) mn < 0

How many hours did it take Helen to drive from her house to her parents' house?

(1) Helen's average speed on this trip was 72 kilometers per hour.
(2) If Helen's average speed on this trip had been 8 kilometers per hour greater, it would have taken her 1 hour less.

How many of the 42 people in a group are employed students?

(1) 29 of the 42 people are employed.
(2) 24 of the 42 people are students.

In the xy-plane, at what two points does the graph of y = (x + a)(x + b) intersect the x-axis?

(1) a + b = -1
(2) The graph intersects the y-axis at (0, -6).

Each person in a certain group supports only one of the two candidates R and T. Of the people in the group, 45 percent support Candidate R and the rest support Candidate T. How many people in the group are in favor of a flat tax?

(1) Of the people in the group who support Candidate R, 58 percent are in favor of a flat tax.
(2) Of the people in the group who support Candidate T, 22 are in favor of a flat tax.