GMAT数学考前练习题目及答案解析,欢迎大家前来了解,并进行练习。
1、 What is the sum of the different positiveprime factors of 550 ?
(A) 10
(B) 11
(C) 15
(D) 16
(E) 18
答案解析
题目翻译:550 的不同正质因子之和
思路点拔:550=2*5^2*11 题目全解:2+5+11=18
Caution!:注意!是不同的质因子之和!
2、At a certainuniversity, the ratio of the number of teaching assistants to the number ofstudents in any course must always be greater than 3:80. At this university, what is the maximumnumber of students possible in a course that has 5 teaching assistants?
(A) 130
(B) 131
(C) 132
(D) 133
(E) 134
答案解析
题目翻译:某大学里,助教和学生的人数比例必须大于 3:80。则某个课程有 5 个助教,学生最多有多少。
思路点拔:5:X>3:80 题目全解:X<5*80/3=133.33,则 X 最大为 133。
3、A furniture dealer purchased a desk for$150 and then set the selling price equal to the purchase price plus a markupthat was
40 percent of theselling price. If the dealer sold thedesk at the selling price, what was the amount of the dealer's gross profitfrom the purchase and the sale of the desk?
(A) $40
(B) $60
(C) $80
(D) $90
(E) $100
答案解析
题目翻译:一个家具商花 150 块钱买了一个桌子,然后把价格定为(买进价格+卖价的 40%)。如果这桌子卖出去了,那么这个商人的毛利是多少? 思路点拔:毛利=收入-成本
题目全解:假设卖价为 X,则加价部分为 0.4X,则买进价格=0.6X=150,求出 X=250。毛利=250-150=100。
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