Question

The ratio of milk and water in 30 litres solution is 7:3. Now,how much water should be mixed in the solution so that the ratio will be 3:7.

give answer in step by step explanation plssssss ​

Answer 1

Answer:

40

Step-by-step explanation:

So a mixture of 30 litres contain water and milk in the ratio 7:3. How much milk should be added to it so that the ratio of water and milk becomes 3:7

Qty. Of water in 30 litres = (7/10)× 30= 21 litres

So the qty. Of milk in 30 litres = 30 - 21 = 9 litres

Let the quantity of milk to be added to make the ratio of water and milk in the ratio 3:7.

Then 21/(9+x) = 3/7. Taking cross products

3(9+x) = 21×7 => 27+3x = 147 => 3x = 147 - 27

=> 3x = 120 => x = 120/3 = 40.

So 40 litres of Water  should be added.