Direct Formula / Rule 24 :
There is a cask which contains 'L' litres of milk
as cost price Rs x/litre. The amount of water, which should
be added to the cask so that the cost of milk reduces to Rs y/litre, is given by
How much water must be added to a cask which contains
40 litres of milk at cost price Rs 3.5/litre so that
the cost of milk reduces to Rs 2/litre?
Detail Method :
Let the x litres of water be added to
the the cask.
Cost price of 40 litres of milk = 40 X 3.5 = Rs 140.
According to the question,
Ailigation Method :
We will apply the alligation on
price of milk, water and mixture.
Quicker Method : Here you can use direct formula :
required amount of water