[計量] PP2-PS107、108、110問題請教

看板GMAT (GMAT入學考試)作者Q7 (T^T)時間15年前 (2011/03/11 01:05)推噓1(1推 0噓 0→)

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PS2 107 Table: Ann $450,000 Bob $360,000 Cal $190,000 Dot $210,000 Ed $680,000 The table above shows the total sales recorded in July for the 5 salespeople at Acme Truck Sales. It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. After this error was corrected, Ann's total sales were still higher than Cal's total sales, and the median of the 5 sales totals was $330,000. What was the value of the incorrectly recorded sale? (A) $30,000 (B) $48,000 (C) $90,000 (D) $120,000 (E) $140,000 一直想不透答案為什麼是D..... 想看看強者的見解，我算出的答案是A 我在想是不是我沒搞懂題目? It was discovered that one of Cal's sales was incorrectly recorded as one of Ann's sales. 這句話我真的不是很懂... PS2 108 畫出來是這樣...應該是對的。 1 0 ├──┴┼─┴─┼┴──┴┼─┴┼┴─┤ On the number line above, the segment from 0 to 1 has been divided into fifths, as indicated by the large tick marks, and also into sevenths, as indicated by the small tick marks. What is the least possible distance between any two of the tick marks? (A) 1/70 (B) 1/35 (C) 2/35 (D) 1/12 (E) 1/7 這題完全陣亡.... 答案是B PS110 During a trip on an expressway, Don drove a total of x miles. His average speed on a certain 5-mile section of the expressway was 30 miles per hour, and his average speed for the remainder of the trip was 60 miles per hour. His travel time for the x-mile trip was what percent greater than it would have been if he had traveled at a constant rate of 60 miles per hour for the entire trip? (A) 8.5% (B) 50% (C) x/12% (D) 60/x% (E) 500/x% 我是算出C，但是答案卻是E...想好久真的想不透囧請高手指點了非常感謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 59.121.151.17 ※ 編輯: Q7 來自: 59.121.151.17 (03/11 02:05)