SAT官方試題分享：2013年11月22日(數(shù)學)

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

正確答案：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.

以上就是SAT官方每日試題分享的詳細內(nèi)容，考生可針對文中介紹的方法進行有針對性的備考。最后，我們預祝大家在SAT考試中取得好成績!