If after 200 grams of water were added to the 15%-solution of…

If after 200 grams of water were added to the 15%-solution of alcohol, the strength of the solution decreased by one-third, how much of the 15%-solution was used?

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 #31547