If 8m − n = p, then which of the following represents…

If 8m − n = p, then which of the following represents the average (arithmetic mean) of m, n, and p, in terms of m?

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 #38278