SAT试题类型 Mathematics > Standard Multiple Choice Read the following SAT test question and then click on a button to select your answer. The sum of the digits of a three-digit number is 12. If the hundreds digit is 3 times the tens digit and the tens digit is 1 over 2 the units digit, what is the tens digit of the number? Answer Choices (A) 2 (B) 3 (C) 4 (D) 6 (E) 9 答案:A 解析: Explanation If x stands for the tens digit, then 3 times x stands for the hundreds digit and 2 times x stands for the units digit. Since the sum of the digits is 12, (3 times x) + x + (2 times x) = 12. Solving this gives x = 2.

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