The following series of numbers follows a rule to progress from number to number. What is the value of Y?

4, 15, 59, Y, 939

Ryan’s class lined up in order of birthdays. If Ryan is the 11th oldest and 9th youngest, how many students are in his class?

There is a set of numbers. The mean of this set of numbers is equal to the median. If four of the numbers are 10, 15, 15, and 17, what is the fifth number?

If the average and median of the group of integers shown below is equal to x, what is the value of x?

40, 11, 62, x, 20, 51, 2

What is the next integer in this series of numbers?

1, 4, 7, 10, 13, ?