Multiple choice

30 litres of salt solution contains 5% salt. How many litres of water must be added so as to get a resultant solution containing 3% salt?

  1. 25 litres

  2. 20 litres

  3. 30 litres

  4. 35 litres

  5. N/A
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Initial salt = 5% of 30 = 1.5 litres. Let x be water added. New total = 30+x. Salt remains 1.5. 1.5 / (30+x) = 0.03. 1.5 = 0.9 + 0.03x. 0.6 = 0.03x. x = 20.

AI explanation

In the 30-litre solution, the amount of salt is 5% of 30, which is 1.5 litres. To achieve a 3% salt concentration, the new total volume must be 1.5 divided by 0.03, which equals 50 litres. The difference between the new volume of 50 litres and the original volume of 30 litres means 20 litres of water must be added.

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