Question

In a mixture the ratio of milk and water 7:5 some mixture drawn off and filled with water how much part of the mixture

Answer 1

Suppose the can initially contains 7x and 5x of mixtures A and B respectively.

Quantity of A in mixture left =  7x - 7 x 9  litres =  7x - 21  litres.

12 4

Quantity of B in mixture left =  5x - 5 x 9  litres =  5x - 15  litres.

12 4

 

7x - 21  

4

= 7

5x - 15  + 9

4

9

28x - 21 = 7

20x + 21 9

252x - 189 = 140x + 147

112x = 336

x = 3.

So, the can contained 21 litres of A.