Question

The length of a rectangular notebook is 15cm and the perimeter is 50 cm. Find the width and area of the notebook.

• A. 8
• B. 9
• C. 10
• D. 11

Answer 1

The correct option is C 10

Let the breadth of the notebook be $ycm$
Length = 15 cm (Given)
Perimeter = 50 cm (Given)
Perimeter of the rectangular notebook = Sum of the lengths of its four sides.

$\Rightarrow 50=15+15+y+y$

$\Rightarrow 50=2(15+y)$

$\Rightarrow 25=(15+y)$

$\Rightarrow y=10$

$\therefore$ The width of notebook is $10cm$

Area covered by the notebook $=15cm\times 10cm=150c{m}^2$