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[资料分享] 【SAT官方每日一题】22/8/12 Mathematics > Standard Multiple Choice [复制链接]

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发表于 2012-8-22 23:50:06 |只看该作者 |倒序浏览
Mathematics > Standard Multiple Choice
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Read the following SAT test question and then click on a button to select your answer.
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For how many positive two-digit integers is the ones digit greater than twice the tens digit?
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A.  
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B.
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E.
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* K, V2 k' O/ }正确答案:A
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解析:' [) m, x/ J5 p( v
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The correct answer is (A). If the tens digit is 1, there are7  positive two-digit integers with the ones digit greater than twice the tens digit: 6 O- m8 E# @9 E  \6 E  ]7 w% X
and 19. If the tens digit is 2 , there are 5  positive two-digit integers with the ones digit greater than twice the tens digit:  and 29. If the tens digit is 3 , there are 3 positive two-digit integers with the ones digit greater than twice the tens digit: and 39. If the tens digit is 4 , there is 4 positive two-digit integer with the ones digit greater than twice the tens digit:49 . If the tens digit is equal to or greater than 5, then the ones digits, which cannot be greater than  9 , 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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