Aptitude:: Area

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The length of a rectangle is halved, while its breadth is tripled. What is the percentage change in area?

A. 25% increase B. 50% increase
C. 50% decrease D. 75% decrease

Answer: Option B

Explanation:

 

Let original length = x and original breadth = y.

Original area = xy.

 

New length = x .
2

 

New breadth = 3y.

 

New area = x x 3y = 3 xy.
2 2

 

 

 Increase % = 1 xy x 1 x 100 % = 50%.
2 xy

 


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