Question

The length of a rectangular notebook is 15cm 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.

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

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

$\Rightarrow 25=(15+y)$

$\Rightarrow y=10$

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