A vessel is fully filled with a special liquid. Four litres of liquid is drawn out of this vessel and is replaced with water. If the ratio of the special liquid to the water becomes 1: 2, then what is the capacity of the vessel?
The correct option is (A): 6 litres Explanation: Let capacity of vessel be \(x\) litres Now, special liquid in the vessel = \((x-4)\) litres and water = 4 litres Ratio=\(\frac{x-4}{4}=\frac{1}{2}\) \(x − 4 = 2\) \(x=6\space litres\)