The average height of 45 telecom towers is 274 m. If the average height of the first 22 telecom towers is 274 m and that of the last 22 telecom towers is 274 m, then what is the height of the 23rd telecom tower? (in m)

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).