Last year Carlos saved 10 percent of his annual earnings. This year he earned 5 percent more than last year and he saved 12 percent of his annual earnings. The amount saved this year was what percent of the amount saved last year?

Which of the following CANNOT be the greatest common divisor of two positive integers x and y ?

Of the following, the closest approximation to ~$\sqrt{~ 5.98(601.5) \over 15.79 ~}$~ is

In a shipment of 120 machine parts, 5 percent were defective. In a shipment of 80 machine parts, 10 percent were defective. For the two shipments combined, what percent of the machine parts were defective?

René earns $8.50 per hour on days other than Sundays and twice that rate on Sundays. Last week she worked a total of 40 hours, including 8 hours on Sunday. What were her earnings for the week?

~$(-1.5)(1.2)-(4.5)(0.4) \over 30$~=

If the average (arithmetic mean) of x, y, and z is 7x and X ≠ 0, what is the ratio of x to the sum of y and z ?

Of all the students in a certain dormitory, ~$1 \over 2$~are first-year students and the rest are second-year students. If ~$4 \over 5$~ of the first-year students have not declared a major and if the fraction of second-year students who have declared a major is 3 times the fraction of first-year students who have declared a major, what fraction of all the students in the dormitory are second-year students who have not declared a major?

On the number line, the shaded interval is the graph of which of the following inequalities?

A positive integer is divisible by 9 if and only if the sum of its digits is divisible by 9.

If n is a positive integer, for which of the following values of k is 25 x 10ⁿ + k x 10²ⁿ divisible by 9 ?