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.
$\Rightarrow 50=15+15+y+y$
$\Rightarrow 50=2(15+y)$
Dividing both side of the equation by 2, we get
$\Rightarrow 25=(15+y)$
Transferring 15 to other side, we get
$\Rightarrow y=25-15=10$
$\therefore$ The width of notebook is $10cm$