Discussion
What should be subtracted from the sum of 9909, 9099 and 9009 to obtain 25454 ?
Answer: D
The number to subtract is 2563.
\[ \begin{aligned} 9909 + 9099 + 9009 &= 28017 \\ 28017 - 25454 &= 2563 \end{aligned} \]
Check: 25454 + 2563 = 28017. The other options rearrange the same digits (2356, 2365, 2536) and fail this check.
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