QA – Placement Quizzes | Mixtures and Alligation | Question 13
A drum filled with a mixture of two liquids l1 and l2 in the ratio 5:7. When 9 liters of mixture is taken out and the replaced by l1. Now the ratio of l1 and l2 is 9:7. How many liters of the liquid l1 were there in the drum initially?
Explanation: Let the initial quantity of l1 in the container be 5x.
Let the initial quantity of l2 in the container be 7x.
Now, 9 liters of mixture is drawn off from the container.
Quantity of l1 in 9 liters of the mixture drawn off
Quantity of l2 in 9 liters of the mixture drawn off
Quantity of l1 remaining in the mixture after 9 liters is drawn off
Quantity of l2 remaining in the mixture after 9 liters is drawn off
Since the container is filled with l1 after 9 liters of mixture is drawn off, quantity of l1 in the mixture
Given that the ratio of l1 and l2 becomes 9:7
Therefore, liters of l1 present in the container initially
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