There are 20 people in a room

There are 20 people in a room. If each person shakes hands with exactly 3 other people, what is the total number of handshakes?

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 #9191