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
: 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%
假設超速的motorists有X%
超速中的人有20%沒拿到speeding tickets
所以拿到的為0.8X%
恰等於題目第一句話的10%
10 = 0.8X
X=12.5 即為答案(B)
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 114.42.72.152
推
03/25 19:30, , 1F
03/25 19:30, 1F
討論串 (同標題文章)