A 90-litre can holds milk and water in the ratio $7 : 2$. Priya draws out 18 litres of the mixture and pours in 18 litres of water. What is the new ratio of milk to water?

Explanation

1. 01

   At first: milk = 70 litres, water = 20 litres.

2. 02

   The 18 litres drawn out are in the ratio $7 : 2$: milk 14 litres, water 4 litres.

3. 03

   Left: milk 56, water 16. After adding 18 litres of water: milk 56, water 34.

4. 04

   Milk : water = $56 : 34 = 28 : 17$.