Question

How many litres of water should be added to $45$ litres of $90\%$ concentrated milk to reduce the concentration to $75\%$?

• A. $8$ litres
• B. $9$ litres
• C. $10$ litres
• D. $12$ litres

Answer 1

The correct option is A $8$ litres

Total milk by volume=90% of 45=40.5 litre of milk.

In the diluted case, let the total volume be 'x' litre. So, 75% of x=40.5 l.

So, x=54 litre, thus volume of added water = (54-45)l= 9 litre.

So the correct option is '9 litres'.