SAT word problem

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Set S consists of all positive multiples of 5 that are less than 100, and set T consists of all positive multiples of 10 that are less than 100. The median of the numbers in set T is how much greater than the median of the numbers in set S?

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The number of multiples of $5$ which are less than $100$ is $\frac{95}{5}=19$. So, the median is the $\frac{19+1}{2}$-th term, which is $50$.

The number of multiples of $10$ which are less than $100$ is $\frac{90}{10} = 9$. By the same process, the median is $50$.

Therefore, the difference is $0$.