How much pure alcohol should be added to 400ml of a 15%…

How much pure alcohol should be added to 400ml of a 15% solution to make the strength of solution 25%?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #16471

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