Question

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

• A. 8 cm
• B. 9 cm
• C. 10 cm
• D. 11 cm

Answer 1

The correct option is C 10 cm

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
= AB + BC + CD + DA

$\Rightarrow 50=15+y+15+y$
$\Rightarrow 50=2(15+y)$
$\Rightarrow 25=(15+y)$
$\Rightarrow y=10$
$\therefore$ The width of the notebook is $10cm$.