# From a cask of milk containing 30 litres, 6 litres are drawn out and the cask is filled up with water. If the same process is repeated a second, then a third time, what will be the number of litres of milk left in the cask? Option 1) Option 2) Option 3) Option 4) Option 5)

$X=30\: L$

$Y= 6\: L$

$N= 3$

$Final\: milk = X (1- \frac{Y}{X}) ^{n}$

$=30 (1-\frac{6}{30})^{3}$

$=30 \times 0.512$

$= 15.36\: L$

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