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?

• A. $\frac{1}{3}$
• B. $\frac{2}{1}$
• C. $\frac{3}{5}$
• D. $\frac{2}{3}$

Answer 1

The correct option is D $\frac{2}{3}$

We know that, fractions are a part of whole.
Part of cup filled + part of cup not filled = 1 (Whole part of the cup is 1)
Given, part of cup filled with milk = $\frac{1}{3}$

Remaining part of the cup which is not filled by milk
= Whole part of the cup - part of the cup filled with milk
$=1-\frac{1}{3}=\frac{3-1}{3}=\frac{2}{3}$
Hence, the part of the cup still to be filled is $\frac{2}{3}$.