The average of five numbers is 100

The average of five numbers is 100. If one number is excluded, the average becomes 110. 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 #49289