The average of seven numbers is 55

The average of seven numbers is 55. If one number is excluded, the average becomes 52. 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 #24633