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Question 23

Length and breadth of a given rectangle are $$2026\,\text{cm}$$ and $$1947\,\text{cm}$$ respectively. A new rectangle is formed by increasing the length and breadth of the given rectangle by $$x\%$$ each such that the area of the new rectangle would be double the area of the given rectangle. Then $$x = $$ ______.


Correct Answer: 100($$\sqrt{2 - 1}$$)

The new area is $$\left(1 + \frac{x}{100}\right)^2$$ times the old area, and this must equal 2, so $$1 + \frac{x}{100} = \sqrt{2}$$. Hence $$x = 100(\sqrt{2} - 1) \approx 41.42$$, independent of the given side lengths.

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