Question

17. Roshan Lal is a milk man and supplies
milk from door to door in his village Kotli.
Normally his 20 litres of a mixture
contains milk and water in the ratio
3: 1. He has a habit of mixing water to
milk. So how much milk must he add to
this mixture to get a mixture containing
milk and water in the ratio 4:1?​

Answer 1

Answer:5 litres

Step-by-step explanation:

Answer 2

Answer:

2litres

Step-by-step explanation:

Let us assume that the quantity of milk as 3x and the quantity of water as 1x

Then, 20litres of a mixture of milk and water

=> 3x * 4x/ 1x * 1x = 20

=> 12x = 20x²

=> x = 12/20

= 0.6

Now, Milk = 3x

= 3 * 0.6

= 1.8 or 2litres (round up)

[P. S. if you know a better way please solve down below. Thank you]