infosys - a container contains 150 litres of mixture of wine and water in the ratio 41 then how much water must be added to this container so that the ratio of wine to water becomes 43 - skillgun

Here the container contains 150 liters mixture of wine and water are in the ratio is 4:1 i.e total 4+1= 5 and 150/5= 30 liters.So if we added the water to the current mixture it will become 4:3 ratio i.e 4+3=7 and 7 * 30 liters=210 liters so according to the given question 120lit+30 lit=150 i.e 4:1 .In the same way 4:3 means