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1. The length of a rectangle is increased by 25%. What percentage should the width be decreased so that the area of the rectangle remains unchanged?
- A. 30%
- B. 30%
- C. 30%
- D. 30%
Answer: Option C
Explanation:
Hints : Let, length = 100x and width = 100y
And z% was decreased from width
So, 100x × 100y = 125x ( 100y - z)
10000xy = 12500xy - 125xz
125xz = 2500xy
z = 20y
অতএব, 20% decreased
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