Question

10 litres of milk contains 8% water.what quantiy of pure milk should be added to this mixture to reduce this to 4% water​

Answer 1

Answer:

10 litres of milk contains quantity of water =8%

X litres of milk contains quantity of water=4

10/X=8/4

10*8=4*x

80=4x

X=80/4

X=20 litres

Answer 2

Answer:

10 litres

Step-by-step explanation:

Given,

Original quantity of mixture = 10 litres,

Water = 8 %,

⇒ Milk = 100% - 8% = 92%,

Thus, the amount of water = 8% of 10 = 0.8 litres,

And amount of milk = 92% of 10 = 9.2 litres,

Let x be the pure milk mixed in the original mixture,

So, resultant mixture = (10 + x) litres,

In which water = 0.8 litres,

Since, resultant mixture has 4% of water,

That is,

$\frac{0.8}{10 + x}=\frac{4}{100}$

$80 = 40 + 4x$

$40 = 4x$

$\implies x = \frac{40}{4}=10$

Hence, 10 litres of pure milk should be added.