Kelly and Chris packed several boxes with books. If Chris packed 60 percent of the total number of boxes, what was the ratio of the number of boxes Kelly packed to the number of boxes Chris packed?

The average (arithmetic mena) of 10, 30, and 50 is 5 more than the average of 20, 40, and x. Then x = ?

If 1 kilometer is approximately 0.6 mile, which of the following best approximates the number of kilometers in 2 miles?

At least $\frac{2}{3}$ of the 40 members of a committee must 2/3 vote in favour of a resolution for it to pass. What is the greatest number of members who can vote against the resolution and still have it pass?

Leona bought a 1-year, $10,000 certificate of deposit that pay interest at an annual rate of 8 percent compounded semiannually. What is the total amount of interest paid on this certificate at maturity?