Question

a mixture of 40 litres of milk and water contain 10% of water .how much water needs to be added to make the water 20% in new mixture​

Answer 1

Answer:

Step-by-step explanation:

Given :-

A mixture of 40 litres of milk and water contain 10% of water.

To Find :-

Required amount of water.

Solution :-

Let water is added to get a mixture containing 20% water be x litres

⇒ 4 + x = New water volume

⇒ 40 + x = Total water volume

⇒ 4 + x/40 + x = 1/5

⇒ 5(4 + x) = 40 + x

⇒ 20 + 5x = 40 + x

⇒ 4x = 20

⇒ x = 20/4

⇒ x = 5

Hence, the Required amount of water is 5 litres.

Answer 2

Answer:

Step-by-step explanation:

Solution :-

Let x litres is the 20% mixing water.

20% of (40 + x) litres = 4 + x

(40 + x)/5 = 4 + x

40 + x = 20 + 5x

x = 5

Hence, required amount of water is 5 litres.