【备考每日练】GMAT数学真题精选实例讲解(二十四练)

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【备考每日练】GMAT数学真题精选实例讲解(二十四练)

GMAT备考,除了背背背,更重要的就是练练练!通过练习,巩固知识,熟练技巧,最终才能在GMAT考试中发挥出色,取得好成绩,所以练习的重要性不言而喻。因此,小编为大家精心准备了GMAT考试各类题型的练习题和答案解析,帮助大家每日一练,为考试做好准备。一起来看今天的题目吧。

【备考每日练】GMAT数学真题精选实例讲解(二十四练)图1

今日练习题为数学题,题目如下

Of all the students in a certain dormitory, 1/2 are first-year students and
the rest are second-year students. If 4/5 of the first-year students have not
declared a major and if the fraction of second-year students who have declared a
major is 3 times the fraction of first-year students who have declared a major,
what fraction of all the students in the dormitory are second-year students who
have not declared a major?

A 1/15

B 1/5

C 4/15

D 1/3

E 2/5

正确答案:

B

【备考每日练】GMAT数学真题精选实例讲解(二十四练)图2

解题思路:

设总人数为100,那么,一年级学生有50个,二年级50个。一年级中没定专业的有40个,定了的有10个。由于二年级学生中定了专业的比例是一年级的3倍,所以二年级学生定了专业的有30个,没定专业的有20个。所以,二年级学生中,没定专业的人数与总人数的比例是20%,即1/5

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