Re: [計量] 幾題計量算不出來...
※ 引述《sqaure (sqaure)》之銘言：
: 遇到一些題目真的看不太懂或者算不出來...
: 懇求大大們幫忙解題~~(沒有任何讀書夥伴...)
: Q10-3
: 11.A company that ships boxes to a total of 12 distribution centers uses
: color coding to identify each center. If either a single color or a pair of
: two diffierent color is chosen to represent each center and if each center is
: uniquely represented by that choice of one or two colors, what is the minimum
: number of colors needed for the coding? (Assume that the order of the colors
: in a pair does not matter.)
: (A)4 (B)5 (C)6 (D)12 (E)24
: Ans:B
C(n 1) + C(n 2) > 12
=> n + n(n-1)/2 > 12
=> n^2 + n > 24
n最小整數解5
: 14.On a certain road, 10 percent of the motorists exceed the posted speed
: limit and receive speeding tickets, but 20 percent of the motorists who
: exceed the posted speed limit do not receive speeding tickets. What percent
: of the motorists on that road exceed the posted speed limit?
: (A)10+1/2 % (B)12+1/2 % (C)15% (D)22% (E)30%
: Ans:B
看不懂題目在問什麼 @@
: 18.Drum X is 1/2 full of oil and drum Y, which has twice the capacity of drum
: X, is 2/3 full of oil. If all of the oil in drum X is poured into drum Y,
: then drum Y will be filled to what fraction of its capacity?
: (A)3/4 (B)5/6 (C)11/12 (D)7/6 (E)11/6
: Ans:C
令Y為Y的總容量 1/2Y為X的總容量
X的油 = 1/2Y * 1/2 = 1/4Y
Y的油 = 2/3Y
X+Y的油 = 1/4Y + 2/3Y = 11/12Y
: 28.In a certain school, 40 more than 1/3 of all the student are taking a
: science course and 1/4 of those taking a science course are talking physics.
: If 1/8 of all the students in the school are taking physics, how many
: students are in the school?
: (A)240 (B)300 (C)480 (D)720 (E)960
: Ans:A
令總學生數x
(x/3 + 40) * 1/4 = x/8
x = 240
--
→
11/07 00:22,
11/07 00:22
推
11/07 00:22,
11/07 00:22
→
11/07 00:22,
11/07 00:22
→
11/07 00:29,
11/07 00:29
推
11/07 00:29,
11/07 00:29
→
11/07 00:30,
11/07 00:30
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.37.141.43
※ 編輯: leetzuwen 來自: 114.37.141.43 (03/24 23:44)
→
03/25 00:51, , 1F
03/25 00:51, 1F
討論串 (同標題文章)
GRE 近期熱門文章
PTT職涯區 即時熱門文章
109
179