How much water be mixed in 36 litre of milk worth Tk. 4.80 per litre, so that value of mixture is Tk. 3.60 per litre?

Question: How much water be mixed in 36 litre of milk worth Tk. 4.80 per litre, so that value of mixture is Tk. 3.60 per litre?

Solution:
Here,
Milk = Tk. 4.80
Mixture = Tk. 3.60
Water = Tk. 0

ATQ,
Ratio of Milk and water will be = 3.60 : 1.20
= 360 : 120
= 18 : 6

∴ In 18 litres milk water added = 6 litres
∴ In 1 litre milk water added = 6/18 litres
∴ In 36 litres milk water added = {(6/18) × 36} litres
= 12 litres