Question

In a mixture of 90 litres, the ratio of milk and water is 2:1.How much water is to be added to make the ratio 1:2?

Answer 1

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Answer 2

The number of litres in the mixture = 90 litres

Given:

Ratio between milk and water = 2: 1

To find:

The amount of water required to make the ratio as 1:2

solution:

Therefore total ratio = 2 + 1 = 3

Quantity of milk $=\frac{2}{3} \times 90=60$ litres

Quantity of water $=\frac{1}{3} \times 90=30$ litres

Let the number of litres of water required is  $a$

To make the ratio of milk and water = 1: 2

$\begin{array}{l}{\frac{60}{30+a}=\frac{1}{2}} \\\\ {120=30+a} \\\\ {a=120-30} \\ \\{a=90}\end{array}$

Therefore, the amount of water required is 90 litres.