Question

You have a 2 litre jug of 3.5% milk (milk that contains 3.5% fat). How much skim milk (0% fat) do you need to add to it to obtain milk which will have 2% fat?

Answer 1

Total amount of skim milk needed to be added = 0.83 liters

Explanation:

Required fat in the resultant milk = 2%

Current amount of fat in the milk = 3.5%

`\text{Amount of base milk in the whole milk which is to be prepared = }(2)/(3.5)\\\\=0.57`

So, 1 - 0.57 = 0.43 liters of skim milk to be added per liter to make the quantity of fat 2% in the whole milk.

Quantity of milk present = 2 liters

So, total amount of skim milk needed to be added = 2 × 0.43

= 0.83 liters