General Aptitude › Area › Question #5331
Single Choice Easy

QA rectangle's length is three times its width. The area of the rectangle is increased by 81 square cm if its length is reduced by 9 cm and its breadth is increased by 9 cm. Determine the rectangle's length.

ID: #5331 Area 210 views
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#5331Q ID
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AreaTopic
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  • A 9 cm ✔ ✖
  • B 18 cm ✔ ✖
  • C 27 cm ✔ ✖
  • D 28 cm ✔ ✖
Correct Answer

Explanation


Let breadth = X. Then, length = 3X.
Then,	(3X - 9) (X + 9) = 3X * X + 81
⇒3X2+27X-9X-81=3X2+81
18X=162
⇒X=9 cm
∴ Length of the rectangle = 9 cm
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