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20. Method: call the unknown number n. From the problem statement, 3n + 15 = 75, or 3n = 75 -15 = 60 and n = 60/3 = 20.

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โˆ™ 2010-02-25 17:30:08
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Q: The sum of three times a number plus 15 is 75 Find the number?
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