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Of the positive integers that are multiples of 30 and are less than or equal to 360, what fraction are multiples of 12 ?
Of the positive integers that are multiples of 30 and are less than or equal to 360, what fraction are multiples of 12 ?
admin
2009-05-19
61
问题
Of the positive integers that are multiples of 30 and are less than or equal to 360, what fraction are multiples of 12 ?
选项
A、1/6
B、1/5
C、1/3
D、2/5
E、1/2
答案
E
解析
在小于等于360的30的正倍数中,12的倍数占了几分之几?
解:本题的正确答案是(E)。该题也就是求30和12的最小公倍数占了小于等于360的30的正倍数的几分之几。解答该题的关键在于理解“of”这个介词的作用。意为“…中”,而that引导的定语从句修饰这些正整数,fraction译为分数,what fraction译为几分之几?30与12的最小公倍数是60,是30的倍数并且小于等于360的正整数共有12个,很显然是60的倍数并且小于等于360的正整数共有6个,所以1/2是正确答案。
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From:RobertLocklear(r.locklear@kangenterprises.com)To:ProductionTeamSubject:Tomorrow’sLuncheonDate:April19,2:21p.m.
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