Question

In 30 litre of mixture, the ratio of milk to water is 7:3. To make their ratio 3:7, how much water should be added to the mixture?
(a) 10
(b) 21
(c) 40
(d) 49​

Answer 1

Answer:

49 ltres

Step-by-step explanation:

First,

The ratio is 7:3.

Let the amount of milk and water be 7x and 3x respectively.

So,

7x + 3x = 30

10x = 30

x = 3.

Now

Amount of milk = 7x = 7 into 3 = 21litre.

Amount of water = 3x = 3 into 3 = 9litre.

Now we need the ratio to be 3:7.

Let the amount of milk and water be 3x and 7x respectively.

So,

3x = 21 ( amount of milk. )

x = 7.

Put x = 7 in 7x.

We get 7 into 7 = 49 litre.

Therefore 49 litre of water has to be added.

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