SSAT Math Question 634: Answer and Explanation
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Question: 634
2. For all real numbers n, $n = 10n - 10.
If $n = 120, then n =
- A. 11
- B. 12
- C. 13
- D. 120
Correct Answer: C
Explanation:
The question asks which of the choices will yield a result of 120. Therefore, use PITA to solve, starting with (C). If n = 13, then replace 13 for n in the given equation: $13 = 10(13) - 10. Simplify to find that $13 = 130 - 10 = 120. This works, so the correct answer is (C).