SAT官方每日一题 2011年3月20日 Mathematics > Standard Multiple Choice Read the following SAT test question and then click on a button to select your answer. Every student who studies art in a certain school receives exactly one of the grades A, B, C, or D. If 1/5 of the students receive A’s, 1/4 receive B’s, 1/2 receive C’s, and 10 students receive D’s, how many students in the school study art? Answer Choices (A) 30 (B) 60 (C) 100 (D) 200 (E) 500 参考答案:D 解析: Explanation The students who receive A’s, B’s, and C’s account for (1/5) + (1/4) + (1/2) of the students, that is, 19/20. This leaves 1/20 of the students receiving D’s. You know that 10 students receive D’s, so 10 is 1/20 of the total. This means that the total number of students is 10 times 20, or 200.

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