The average of five numbers is 30

The average of five numbers is 30. If one number is excluded, the average becomes 28. The excluded number is?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #47152