Discussion
When 15 is added to a number, the result equals four times the number decreased by 15. The number is:
Answer: A
The equation is \(x + 15 = 4x - 15\). Collecting terms gives \(3x = 30\), so \(x = 10\). Check: \(10 + 15 = 25\) and \(4 \times 10 - 15 = 25\). Reading the phrase as \(4(x - 15)\) instead changes the answer, so the wording must be parsed carefully.
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