Take a lift and guess the floor

Algebra Level 4

A lift was coming down stopping at each floor. A person in the lift was asked to guess the floor at every successive stop. The guesses made were in this order: 30, 23, 26, 29, 20, 28, 24, 21, 25, 27, and 22. If all the guesses except one were wrong, then which one was correct?

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