NinetynineAdding a pure component to shift a mixture's concentration
CAT has tested this idea 3 times across 3 papers, from 2020 to 2024. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.
| Question | What it asks | Answer |
|---|---|---|
| CAT 2024 Slot 2 · QA Q19 | add 2 L water to get 50%, then 15 L acid to get 80% | D |
| CAT 2021 Slot 3 · QA Q1 | alloy plus pure silver gives 90%, plus 90% alloy gives 84% | A |
| CAT 2020 Slot 1 · QA Q26 | water added to dye, quarter removed, dye added back to 2:3 | 8 |
Part of Ratio, Mixtures & Averages (84 questions since 2017).