Question

Three-fifths part of a box is filled with rice. What part of the box is left empty? Write your answer as a decimal.

• A. $0.2$
• B. $0.4$
• C. $0.8$
• D. $0.6$

Answer 1

The correct option is B $0.4$

Fraction of box filled with rice = $\frac{3}{5}$

Fraction of box left empty = $\frac{2}{5}$


$\text{Now, to convert the fraction into a}$ $\text{decimal number, make the}$ $\text{denominator 10.}$

So, multiply the numerator and the denominator by 2 to make the denominator 10.

$\frac{2\times 2}{5\times 2}=$ $\frac{4}{10}$

$\text{We know that,}\frac{1}{10}$ $\text{represents one-tenth, which is equal}$ $\text{to 0.1}.$

$\text{Similarly,}\frac{4}{10}\text{represents 4}tenths.$

∴ $\frac{4}{10}=0.4$