Multiple choice

A 10 litre solution of water and salt contains 150 g of salt. If 25% of the solution gets evaporated, then what percentage of salt would be left in the remaining solution?

  1. 1.5

  2. 2.0

  3. 1.75

  4. 2.5

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial solution = 10L, salt = 150g. 25% of solution evaporates, so 7.5L remains. The amount of salt remains 150g. Percentage of salt = (150g / 7500g) * 100 = 2%.

AI explanation

In the initial 10-litre solution, 150 grams of salt means the salt constitutes 1.5 percent of the total weight, assuming the solution's density is 1 kg per litre. When 25 percent of the solution evaporates, only the water is removed, and the amount of salt remains exactly 150 grams. The remaining solution volume is 75 percent of 10 litres, which equals 7.5 litres or 7500 grams. The percentage of salt in this remaining solution is calculated as 150 divided by 7500 and multiplied by 100, which equals 2.0 percent.

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