2021 · Q68
In a mixture of 80 liters of a liquid and water, 25% of the mixture is the liquid. How much water should be added to the mixture so that the liquid becomes 20% of the mixture?
Elementary MathematicsPercentages
- A15 litres
- B20 litres
- C24 litres
- D25 litres
Explanation
The mixture has 25% of 80 = 20 litres of liquid. Adding w litres of water: 20/(80+w) = 20/100, so 80 + w = 100 and w = 20 litres. Hence option B.