Multiple choice

A 100 litre spirit water solution contains 75% spirit. Find the volume of water to be added to convert it into 60% spirit solution.

  1. 15 litres

  2. 25 litres

  3. 40 litres

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

Initial spirit = 75 litres. Let x be water added. New total volume = 100 + x. 75 / (100 + x) = 0.6. 75 = 60 + 0.6x. 15 = 0.6x. x = 25.

AI explanation

The 100-litre solution contains 75 litres of spirit and 25 litres of water. To make it a 60% spirit solution, the 75 litres of spirit must represent 60% of the new total volume, meaning the new total volume is 75 divided by 0.60, which equals 125 litres. The difference between the new total of 125 litres and the original 100 litres means 25 litres of water must be added.

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