sat 考試官方網站每日一題小結，以下是 SAT 數學部分。
Read the following SAT test question, then click on a button to select your answer.
There are n students in a biology class, and only 6 of them are seniors. If 7 juniors are added to the class, how many students in the class will not be seniors?
A.n – 3
B.n – 2
C.n – 1
D.n + 1
E.n + 2
Correct Answer: D
Here"s Why:
At first, there are n students in the class, and 6 of them are seniors. It follows that initially n – 6 students are not seniors. If 7 juniors are added to the class, there will be n – 6 + 7, or n + 1, students in the class who are not seniors.
Difficulty: Medium
Question Type: Standard Multiple Choice
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