SAT官方每日一题2011.7.24-百利天下旗下前程百利

SAT官方每日一题2011.7.24

信息来源：网络发布时间:2011-07-26

2011年7月24日

考试类型:Mathematics > Standard Multiple Choice

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

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

A. 7 over 2

B. 7 over 8

C. 3 over 7

D. 1 over 7

正确答案:A

解析:

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

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

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