Algebra Hard 5

5 years ago the average age of P & Q was 15 years. Average age of P, Q & R today is 20 years. How old will R be after 10 years?

If xy<0 and y>0 which of the following must be positive?

(4^41+4^42+4^43) is divisible by

If 1/x² > x, then x must be

How many digits at most do you get in a number obtained by multiplying a two 3-digit numbers?

The next number in the series, 7, 2, 6, 2, 5, 2,___?

If the sum of five consecutive integers is 40, what is the smallest of these five integers?

If a is 3 less than b/2, then which of the following gives b in terms of a?

Which of the following numbers is a prime?

Which is the best approximation of the product of (2.005) X (10.0025) X (0.0205)?