Question

In 28 litres mixture of milk and water, the ratio of milk and wa ter is 5 : 2. How much water should be added in the mixture so that the ratio of milk to wa ter becomes 2 : 5?​

Answer 1

Answer:

Milk is=5*28/(5+2)=20 litre. So water should be half of this =10 litre. So water to be added=(20+10)-28 =2 litre.

Answer 2

Answer:

Step-by-step explanation:

Let’s consider ratio be x

ATQ

5x + 2x = 28

7x =28

x = 28/7 =4

so amount of milk = 5x 4 = 20 l

and amount of water = 2x4 = 8 l

to change the ratio to 2:5

amount of water need to be increase =y

ATQ

amount of milk / amount of water + y = 2/ 5

= 20/(8 +y)=2/5

= 20 x 5 = 2 (8+y)

=100 = 16 +2y

= 100 - 16 = 2y

=84 /2 = y

= 42 = y

so water to be added is 42 l

now total volume is 70 litres

now new volume of water is 42 +8 = 50 l

and amount of milk = 20