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UPSC CDS Math Area and Perimeter Questions
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© examsnet.com
Question : 18
Total: 116
A rectangular red carpet of size 6 ft x 12 ft has a dark red border 6 inches wide. What is the area of the dark red border ?
[2019 CDS-I]
9 square feet
15 square feet
17 square feet
18 square feet
Validate
Solution:
Area of carpet
=
6
×
12
=
72
square feet
6 inches = 0.5 feet
Area of carpet excluding border
=
[
{
6
–
(
0.5
+
0.5
)
}
×
{
12
–
(
0.5
+
0.5
)
}
]
=
5
×
11
=
55
square feet
Area of border = 72 – 55 = 17 square feet
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