下面就是我们为大家整理了SAT官方每日试题分享,供考生们参考,以下是详细内容。
2013年11月21日
Read the following SAT test question and then click on a button to select your answer.
For how many positive two-digit integers is the ones digit greater than twice the tens digit?
(A) 16
(B) 20
(C) 28
(D) 32
(E) 36
正确答案:A
解析:
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 digits, which cannot be greater than
, is not greater than twice the tens digit. Therefore, there is a total of
positive two-digit integers for which the ones digit is greater than twice the tens digit.
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