Subject
Bank Exam
Topic
Janata Bank 2012 Executive Officer(EO)
The length of a rectangle is increased by 25%, what percentage should the width be decreased so that the areas of the rectangle remains unchanged ?
The length of a rectangle is increased by 25%, what percentage should the width be decreased so that the areas of the rectangle remains unchanged ?
ক)
20%খ)
30%গ)
40%ঘ)
25%Explanation
Let length = 100x & width =100y So, area = 100x * 100y Let p% was decreased so, 10000xy = (100+25)x*(100y-z) 125xz = 2500xy => z = 20y So % decrease = 20y/100y * 100% = 20%Related questions
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