下面是是2012年3月7日的SAT官方每日一题的内容，是关于数学方面的，题型是选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。下面我们就一起来看一下这个SAT官方每日一题吧。
SAT官方每日一题之数学---选择：
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Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
On the last day of a one-week sale, customers numbered 
through 
were waited on. How many customers were waited on that day?
Answer Choices
(A) 
(B) 
(C) 
(D) 
(E) 
The correct answer is C
Explanation
The number of customers who were waited on that day is 
, as the total number of customers is those customers numbered 
to 
inclusive.
下面是一道和SAT官方每日一题相似的题目，供大家练习：
For how many positive two-digit integers is the ones digit greater than twice the tens digit?
A. 
B. 
C. 
D. 
E. 
The correct answer is A
Explanation
The correct answer is (A). If the tens digit is 
, there are 
positive two-digit integers with the ones digit greater than twice the tens digit: 
and 
. If the tens digit is 
, there are 
positive two-digit integers with the ones digit greater than twice the tens digit: 
and 
. If the tens digit is 
, there are 
positive two-digit integers with the ones digit greater than twice the tens digit: 
and 
. If the tens digit is 
, there is 
positive two-digit integer with the ones digit greater than twice the tens digit: 
. If the tens digit is equal to or greater than 
, then the ones digi
