A 108-liter mixture contains milk and water in the ratio 7:2. If 27 liters of this mixture are removed and replaced with 9 liters of pure milk, what is the new ratio of milk to water in the mixture?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 4:1.
Milk in mixture = (7/9) × 108 = 84 liters
Water in mixture = (2/9) × 108 = 24 liters
Milk removed = (7/9) × 27 = 21 liters
Water removed = (2/9) × 27 = 6 liters
Remaining milk = 84 - 21 = 63 liters
Remaining water = 24 - 6 = 18 liters
New milk = 63 + 9 = 72 liters
New ratio of milk to water = 72 : 18 = 4 : 1