Question

A book of length $20cm$ and breadth $5cm$ is kept on a table. Its area is _________.

• A. $50c{m}^2$
• B. $100c{m}^2$
• C. $150c{m}^2$
• D. $200c{m}^2$

Answer 1

The correct option is B

$100c{m}^2$

Step - 1: Given

Length of book $l=20cm$

Breadth of book $b=5cm$

Step - 2: Formula

Area of a rectangle, $Area\left(a\right)=length\left(l\right)\times breadth\left(b\right)$

Step - 3: Area of book occupied

$$\begin{gathered} Area\left(a\right)=length\left(l\right)\times breadth\left(b\right) \\ Area\left(a\right)=20cm\times 5cm \\ Area\left(a\right)=100c{m}^2 \end{gathered}$$

Hence, option B is correct.