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Question

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


A
8
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B
9
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C
10
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D
11
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Solution

The correct option is C 10

Let the breadth of the notebook be y cm.
Length = 15 cm (Given)
Perimeter = 50 cm (Given)
Perimeter of the rectangular notebook = Sum of the lengths of its four sides.
50 = 15 + 15 + y + y
50 =2(15 +y)
25 = (15 + y)
y = 10 cm
The width of notebook is 10 cm

Area covered by the notebook =15 cm×10 cm=150 cm2


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