GMAT数学精华题型解析(5)

　　GMAT数学考试常见题型的解题技巧有哪些呢?以下将为大家深入分析GMAT数学考试常见题型的解题策略和技巧，希望能够为考生备战GMAT数学考试带来帮助。

　　114. 11816-!-item-!-187;#058007868

　　Henry purchased 3 items during a sale. He received a 20 percent discount off the regular price of the most expensive item and a 10 percent discount off the regular price of each of the other 2 items. Was the total amount of the 3 discounts greater than 15 percent of the sum of the regular prices of the 3 items?

　　 The regular price of the most expensive item was $50, and the regular price of the next most expensive item was $20.

　　 The regular price of the least expensive item was $15.

　　【答案】A

　　135. 13860-!-item-!-187;#058009754

　　During a one-day sale, a store sold each sweater of a certain type for $30 more than the stores cost to purchase each sweater. How many of these sweaters were sold during the sale?

　　 During the sale, the total revenue from the sale of these sweaters was $270.

　　 During the sale, the store sold each of these sweaters at a price that was 50 percent greater than the stores cost to purchase each sweater.

　　【答案】C

　　139. 14108-!-item-!-187;#058009811

　　A set of 15 different integers has a median of 25 and a range of 25. What is the greatest possible integer that could be in this set?

　　 32

　　 37

　　 40

　　 43

　　 50

　　【答案】 D

　　【思路】

　　Range定義=最大值-最小值

　　題目問說哪個最有可能是最大值,所以從最大的先推推看,遇到直接做起来难的题目，从答案分析

　　E)Max:50,range25代表Min=50-25=25 ==可是25又是中位數,所以不可能!!

　　D)Max:43,range25代表Min=43-25=18

　　列舉驗證一下: 18 19 20 21 22 23 24 25 ........43

　　總共15個,所以中位數左邊應該有7個

　　剛好25也是中位數,所以成立!!

　　因為range25,各選項間距為

　　=

　　由於15個不同的數字,此外,中位數為25=只有D選項符合

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　　142. 14580-!-item-!-187;#058010013 分页标题#e#

　　The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

　　 100% decrease

　　 50% decrease

　　 40% decrease

　　 40% increase

　　 50% increase

　　【答案】D

　　174. 17336-!-item-!-187;#058011114

　　In the xy-plane, what is the y-intercept of line l

　　 The slope of line l is 3 times its y-intercept.

　　 The x-intercept of line l is -一定要代入后看是否能可以解常考陷阱

　　【答案】E

　　177. 17595-!-item-!-187;#058011159

　　If x and y are positive integers, what is the value of xy ?

　　 The greatest common factor of x and y is 10.

　　 The least common multiple of x and y is 180.

　　【答案】C

　　两个数的乘积=其最大公约数最小公倍数

　　以上为大家推荐了一些GMAT数学试题的使用解题技巧，考生不妨从中借鉴，通过针对性的练习来逐步掌握GMAT数学考试的解题技巧，从而在GMAT考试中发挥出更好的水平。