【SAT每日一题】2013年5月7日SAT官方每日一题

2013-05-07 13:20:00 来源: SAT 责编：楷维留学指南

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好评率:100%

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

In a class of seniors, there are boys for every girls. In the junior class, there are boys for every girls. If the two classes combined have an equal number of boys and girls, how many students are in the junior class?

D. 100

E. 120

正确答案:D

解析:

Among the eighty seniors, there are boys for every girls, so 3 over 8 of the seniors, or , are boys and 5 over 8 , or , are girls. Among the juniors, 3 over 5 are boys and 2 over 5 are girls. If stands for the total number of juniors, then (3 over 5) times x are boys and (2 over 5) times x are girls. The total number of senior and junior boys is 30 plus ((3 over 5) times x) . The total number of senior and junior girls is 50 plus ((2 over 5) times x) . The question states that these quantities are equal, so 30 plus ((3 over 5) times x) = 50 plus ((2 over 5) times x) . Solving this gives 150 + 3 times x = 250 + 2 times x , or x = 100 .