The present ages of three persons in proportions 2

The present ages of three persons in proportions 2 : 7 : 9. Eight years ago, the sum of their ages was 30. Find their present ages (in years).

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 #4423