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SAT官方每日一题附答案和解析[数学](2015年2月27日)
日期:2015-02-27 13:56

(单词翻译:单击)

每日一题

Mathematics>Standard Multiple Choice


Read the following SAT test question and then click on a button to select your answer.

If a, b, and c are numbers such that a/b = 3 and b/c = 7, then (a+b)/(b+c) is equal to which of the following?

(A) 7/2
(B) 7/8
(C) 3/7
(D) 1/7
(E) 21

答案和解析

答案:A

解析:

From a/b = 3 is implied that (a+b)/b = 4 (1)

And from b/c = 7 is implied that b/(b+c) = 7/8 (2)

If we multiply (1) and (2) together, we have that (a+b)/(b+c) = 4*(7/8) = 7/2 (b is canceled out).

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重点单词
  • multiplyvt. 乘,增加 vi. 扩大,繁衍,做乘法 adv.
  • multipleadj. 许多,多种多样的 n. 倍数,并联