2012 Countdown

An odd integer between 600 and 800 is divisible by both 9 and 11. What is the

sum of its digits?

Mr. Masterson rolls two standard, six-sided dice. What is the probability that

he gets a square number on one of the dice and an odd number on the other?

Express your answer as a common fraction.

The second and fourth digits of a five-digit integer N are interchanged to form

the integer K. What is the remainder when | N – K | is divided by 11?

What is the closest integer to –2.58?

If the length of a rectangle is increased by 30% and its width is decreased by

20%, by what percent is the area increased?

The average of a, b and c is 60, and the average of a and b is 90. What is the

value of c?