Question 59

There is 10% water in a 40-litre solution of milk and water. If 10 litres of water are added to this solution, then what percentage of the new solution will be water?

Solution

There is 10% water in a 40-litre solution of milk and water.

initial quantity of water = 40 litre of 10%

= $$40\times\frac{10}{100}$$

= 4 litre

If 10 litres of water are added to this solution.

quantity of water now = (4+10) litres = 14 litres

Percentage of water in the new solution = $$\frac{14}{(40+10)}\times\ 100$$

= $$\frac{14}{50}\times\ 100$$

= $$14\times2$$

= 28%

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