Question : $x$ is 5 times longer than $y$. The percentage by which $y$ is less than $x$ is:
Option 1: 50%
Option 2: 40%
Option 3: 80%
Option 4: 70%
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Correct Answer: 80%
Solution : Let the length of $y$ be $l$. Then, the length of $x$ is $5l$. Required percentage = $\frac{x-y}{x}\times 100 = \frac{5l-l}{5l}×100 = 80$% Hence, the correct answer is 80%.
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