? = $200,000
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To simplify the question, imagine the numbers are divided by 10,000 or so. For example, 15, 12, and 8.
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Ideally, you could add 15 + 12 + 8 and get 35.
15 + 12 + 8 = 35
Next, subtract 35 from 55.
55 - 35 = 20
Multiply 20 by 10,000, and you'll get 200,000.
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Good luck!
~pinetree :)