A 40-litre mixture contains milk and water in the ratio 3 : 1. How many litres of water must be added to make the ratio 1 : 1?

Question

A glass is initially filled entirely with milk. In each step, $\frac{2}{3}$ of the milk is replaced with water. This process is repeated 3 times. What is the final ratio of water to milk in the glass?

Answer 1

Milk (30 L) does not change. For a 1 : 1 mix the total must be $30 \times 2 = 60$ L. So added water $= 60 - 40 = 20$ litres.

A 40-litre mixture contains milk and water in the ratio 3 : 1. How many litres of water must be added to make the ratio 1 : 1?

Show Hint

The Correct Option is C

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