Multiple choice

A 5 litre jug contains 4 litres of salt water solution that contains 15 percent salt. If 1.5 litres of the solution spills out of the jug and the jug is filled to capacity with water, approximately what percent of the resulting solution in the jug is salt?

  1. 7.5%

  2. 9.5%

  3. 10.5%

  4. 12%

  5. 13%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Initial salt = 4 * 0.15 = 0.6 litres. After 1.5 litres spills, remaining solution = 2.5 litres. Remaining salt = 2.5 * 0.15 = 0.375 litres. Jug filled to 5 litres with water. New concentration = 0.375 / 5 = 0.075 = 7.5%.

AI explanation

The initial 4 L of solution contains 15 percent salt, yielding 0.6 L of salt. When 1.5 L spills out, 2.5 L of the solution remains, meaning the remaining salt is 2.5 L multiplied by 0.15, which is 0.375 L. After filling the 5 L jug to capacity with pure water, the 0.375 L of salt is divided by the total 5 L volume, resulting in a concentration of 7.5 percent.

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