R runs for 10 hours at speeds of 10 km/h, 9 km/h, ..., 1 km/h, respectively, in the first hour, second hour, and so on. His average speed is _______ km/h.

The average of 100 numbers is 40. If one of the numbers, 30, is replaced by 70 while keeping the other numbers same, what is the new average?

The arithmetic mean of 22.5, 56, 42.5, 2x + 1, x - 2, 3x, and 36 is 30. Find the value of x (where x > 0).