GMAT考试PREP-MATH-PS2完整详解版-V1.0.doc

PP- Problem Solving2 (PS2) 完整詳解版 V1.0 作者: yuma168 larry.tw Huang Hsin-Yi Penda Engedi mauricew pauline_chiou william0625 abc123 ruru.lu 備註：本版權內容歸 作者 和 論壇共有，嚴禁任何未經允許的商業使用。 Revised History 由於這是眾人一起完成的,難免會有疏失,希望大家可以一起修正錯誤,讓這份詳解變得更完整! 版本增加規則如下: 修正算式錯誤or提出更好的算法, 請把版本小數+1 (Ex: V1.0 - V1.1) 增加or補齊題目,請把版本個位數+1 (Ex: V2.0 -V3.0) 版本 修正內容 (請標題號) 作者 日期 V1.0 新增全部詳解 (Q1~Q197) yuma168 larry.tw Huang Hsin-Yi Penda Engedi mauricew pauline_chiou william0625 abc123 ruru.lu 2008/7/17 Practice Test #2 Problem Solving (197 Questions) 1. 246-!-item-!-187;#058000117 Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its correct address. If the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address? (A) (B) (C) (D) (E) 2. 509-!-item-!-187;#058000281 For every order, a certain mail-order company charges a shipping fee of $3 plus an additional $2 if the value of the order is over $50 but not over $100 or an additional $3 if the value of the order is over $100. How much greater are the total shipping fees for 2 orders of $75 each than the total shipping fee for 1 order of $150 ? (A) $1 (B) $2 (C) $3 (D) $4 (E) $5 ------------------------------------------------------------------------------------------------------------------------------------ 【答案】D 【思路】 2 orders of $75 each : 每件價值都75,所以要額外費用2元,且又兩件, 2(3+2)=10 1 order of $150: 1(3+3)=6 依照題意相減可得4 ------------------------------------------------------------------------------------------------------------------------------------ 3. 827-!-item-!-187;#058000411 A copy service charges $0.05 per copy for the first 100 copies, $0.04 per copy for the next