A jug holds 45 litres of a milk–water mixture in the ratio $7 : 2$. Asha adds 5 litres of water. What percentage of the new mixture is water?

Explanation

1. 01

   Water at first = $\frac{2}{9} \times 45 = 10$ litres.

2. 02

   After adding: water = 15 litres, total = 50 litres.

3. 03

   Water % = $\frac{15}{50} \times 100 = 30\%$.