A museum has an average of 300 visitors per day from Monday to Friday, and 1,000 visitors per day on the weekends (Saturday and Sunday). What is the average number of visitors per day in a complete week?

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).