The grade point average of one third of the classroom is 15…

The grade point average of one third of the classroom is 15; the grade point average of the rest is 18. What is the grade point average of the whole class?

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 #13662