Multiple choice general knowledge math & puzzles

A solution is made of water and pure acid. If 75% of the solution is water, how many litters of pure acid are in 20 litters of this solution?

  1. 15

  2. 25

  3. 5

  4. 20
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since 75% of the solution is water, the remaining 25% must be pure acid. For 20 liters of solution, 25% × 20 = 5 liters of pure acid. Option A (15) represents the water portion, not the acid.

AI explanation

If 75% of the 20-liter solution is water, the remaining 25% is pure acid. Calculating 25% of 20 liters gives 0.25 * 20 = 5 liters of acid.

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