Re: [計量] GWD2-15,16
※ 引述《jazzbruce (小布)》之銘言：
: ※ 引述《candyme ()》之銘言：
: : 15.
: : Tanks A and B are each in the shape of a right circular cylinder.
: : The interior of tank A has a height of 10 meters and a circumference
: : of 8 meters and a circumference of 10 meters. The capacity of tank A
: : is what percent of the capacity of tank B ?
: : A.75%
: : B.80%
: : C.100%
: : D.120%
: : E.125%
: : ANS: B
: This question is incomplete.
怎麼會不完整 = =a
題目: 圓周比 8:10 高 10:8 問容量比
圓周公式 2拍r (拍不知道怎麼打) =>則半徑比 8:10 = 4:5
面積公式 拍r平方 => 16:25
所以 體積比 = 16*10 : 25*8 = 4:5
所以就可以得出答案了 我碰到這種問題都是化成100 => 80 :100
所以A的容量就是B容量的80%
以上 希望有幫助 有錯請指正
: : 16.
: : Meg and Bob are among the 5 participants in a cycling race. If each
: : participant finishes the race and no two participants finish at the
: : same time, in how many different possible orders can the participants
: : finish the race so that Meg finishes ahead of Bob ?
: : A.24
: : B.30
: : C.60
: : D.90
: : E.120
: : ANS:C
: : Thanks for your help!!!
: 4!+C3取1*3!+C2取1*3!+3! =24+18+12+6 =60
: ^^^^^^^^Meg as Rank2, Bob can be one of three participants behind, and
: multiple premutation of other 3 players.
: Logic: First decide the rank of Meg and Bob, then consider the premutation of
: other 3 participants.
: ***Hope this helps to answer.
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