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Of the positive integers that are multiples of 30 and are less than or equal to
Of the positive integers that are multiples of 30 and are less than or equal to
游客
2024-01-12
31
管理
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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