Question

A cup is $\frac{1}{3}$ full of milk. What part of the cup is still to be filled by milk to make it full ?

Answer 1

Given, cup is $\frac{1}{3}$full of milk.

$\therefore$Required milk

$$\begin{gathered} =1-\frac{1}{3} \\ =\frac{3-1}{3} \\ =\frac{2}{3} \end{gathered}$$

Hence, $\frac{2}{3}$ part of the cup is still empty.