[計量] PP1-PS-51.57.62.63.71

看板GMAT (GMAT入學考試)作者amateurptt (剩自己了...)時間16年前 (2008/06/16 22:50)推噓0(0推 0噓 0→)

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hjjh 51. Circular gears P and Q start rotating at the same time at constant speeds. Gear P makes 10 revolutions per monute, and gear Q makes 40 revolutions per minute. How many seconds after the gears start rotating will gear Q have made exactly 6 more revolutions than gear P? (A)6 (B)8 (C)10 (D)12 (E)15 ans:D ============================================================================ 57. If n is a multiple of 5 and n = (p^2)q, where p and q are prime numbers, which of the following must be a multiple of 25? (A)p^2 (B)q^2 (C)pq (D) (p^2)(q^2) (E) (p^3)q ans:D ============================================================================= 62. Alice's take-home pay last year the same each month, and she saved the same fraction of her take-home pay each month. The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take-home pay that she did not save. If all the money that she saved last year was from her take-home pay, what fraction of her take-home pay did she save each month? PP中並無選項出現但是我還是想要知道解題思路謝謝~ ============================================================================== 63.For which of the following function is f(a+b) = f(a)+f(b) for all positive numbers a and b? (A) f(x)=x 2 (B) f(x)=x+1 (C) (D) (E) f(x)=-3x ans:E 這一題我也是算E, 但是A選項也通呀! ============================================================================ 71. On July 1 of last year, the total number of employees at Company E was decreased by 10 percent. Without any charge in the salaries of the remaining employees, the average ( arithmetic mean ) employee salary was 10 percent more after the decrease in number of empolyees than before the decrease. The total of the combined salaries of all of the employees at Company E after July 1 last year was what percent of that before July 1 last year? (A) 90% (B) 99% (C) 100% (D) 101% (E) 110% ans:B 這題讓我很confuse 希望板大熱心提供解題方法謝謝大家~~ -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 122.122.0.196 ※ 編輯: amateurptt 來自: 122.122.0.196 (06/16 22:52) ※ 編輯: amateurptt 來自: 122.122.0.196 (06/16 22:53) ※ 編輯: amateurptt 來自: 122.122.8.249 (06/17 21:35)