In a mixture of 90 L, the ratio of milk and water is 2 : 1. If the ratio of the milk and water is to be 1 : 2, then the amount of water to…

Let initially the water be x L

∴ the milk is 2x L

Now, total volume is 90 L

∴ x + 2x = 90

⇒ x = 90/3 = 30 L

∴ initial volume of water = x = 30 L

Initial volume of milk = 2x = 2 × 30 = 60 L

Now, we want a mixture where ratio of milk to water is 1 : 2

∴ volume of water should be double the volume of milk

∴ required volume of water = 2 × 60 = 120 L

∴ volume of water to be added = 120 L – 30 L = 90 L

Let initially the water be x L

∴ the milk is 2x L

Now, total volume is 90 L

∴ x + 2x = 90

⇒ x = 90/3 = 30 L

∴ initial volume of water = x = 30 L

Initial volume of milk = 2x = 2 × 30 = 60 L

Now, we want a mixture where ratio of milk to water is 1 : 2

∴ volume of water should be double the volume of milk

∴ required volume of water = 2 × 60 = 120 L

∴ volume of water to be added = 120 L – 30 L = 90 L