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The length of a rectangle is increased by 60%. By what per cent would the width have to be decreased to maintain the same area ?
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- 371/2%
- 60%
- 75%
- None of these
Correct Option: A
Let length of a rectangle = 100 m,
Breadth = 100 m
New length = 160 m,
New breadth = B meters
Then, 160 x B = 100 x 100
⇒ B = (100 x 100) / 160 = 125/2
Decrease in breadth = (100 - 125/2)% = 371/2%
