In a public show 50 % of the seats were filled

In a public show 50 % of the seats were filled. If there were 600 seats in the hall, how many seats were vacant?

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 #54377