A 30 kg solution contains 30% salt. After adding 15 kg of pure water, what percentage of the new mixture is salt?
Answer and explanation
Correct answer: B.
- Step 1: Salt mass: kg. Step 2. New total mass: kg. New percentage: . **Answer: . Why not the others:** assumes the percentage does not change; subtracts a share of the water; divides by the water mass.
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