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Dennis thinks of a number. He adds 0.5 to that number and then multiplies the new result by 4. He then subtracts 2 and divides the number by 2. His final answer is 48. What number did Dennis start with?

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Interesting fact:

Here’s a bit of a tongue-twister… the series of “ions” goes: million, billion, trillion, quadrillion, quintillion, sextillion, septillion, octillion, nonillion, decillion, and undecillion.