A race is 20 miles long . There is water station every 1 1/4 miles along the race route. How many water stations are needed for this race ?

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

You are cycling around europe with friends. a cycling festival is starting soon in barcelona. it will take 4.5 hours to cycle there. how many minutes in total is this?

Which of the following is not a subset of {1,2,3}?