A mixture of 150 liters of wine and water contains 20% water. How much more water should be added so that water becomes 25% of the new mixture?
Correct answer: C. 10 liters
- A. 7 liters
- B. 15 liters
- C. 10 liters
- D. 9 liters
Explanation
The original 150 litres contains 20% water = 30 litres of water and 120 litres of wine. If x litres of water are added, (30 litres + x litres) / (150 litres + x litres) = 25/100, so 30 + x = 37.5 + 0.25x and x = 10 litres. The likely mistake is option b, 15 litres, from taking 25% of the original 150 litres instead of the new total.
Last updated
About Ratio and Proportion
Ratios compare quantities in the same units, while proportions state that two ratios are equal. Problems cover simplification, division in a given ratio, direct and inverse variation, scale, and missing terms, with attention to the difference between a ratio and a fraction representing part of a whole.
Practise Arithmetic
1,060 free Arithmetic MCQs from Mathematics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Mathematics questions like this
Mathematics is on 67 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.