In 80 litres mixture of milk and water, the ratio of amount of milk to that of amount of water is 7 : 3. In order to make this ratio 2 : 1, how many litres of water should be added?
Answer & explanation
Correct answer: option 3
Total Quantity of Mix of Milk and Water = 80 litres
Ratio of Milk M : Water W = 7: 3
M = 80 × (7x/10) = 56
W = 80 × (3x/10) = 24
Required Ratio = 2:1
Let us add "P" litres of water
56/(24+P) = 2/1
48+2P = 56
2P = 8
P = 4
The correct answer is Option (3) → 4 litres