GWD 11-11

[hoojjj]

Q11:
The total cost of an office dinner was shared equally by k of the n employees who attended the dinner. What was the total cost of the dinner?
(1) Each of the k employees who shared the cost of the dinner paid $19.
(2) If the total cost of the dinner had been shared equally by k + 1 of the n employees who attended the dinner, each of the k + 1 employees would have paid $18.

看不懂題目
運算式是???
感恩

[stupidgirl]

stupidgirl來解解看..有錯請指正喔^^
有N名員工,其中K名員工有去晚餐並平均分攤總餐費.問: 總餐費為多少勒??
1. K名員工中,每個人分擔的餐費為19元
2. 如果變成K+1名員工去晚餐,平均分攤總餐費.每個人分擔的餐費則變成18元

由條件1得:總餐費=19K
由條件2得:19k/k+1=18
1+2得:K=18
總餐費就為18*19=342
答案為(C)

[FannyHsieh]

stupidgirl來解解看..有錯請指正喔^^
有N名員工,其中K名員工有去晚餐並平均分攤總餐費.問: 總餐費為多少勒??
1. K名員工中,每個人分擔的餐費為19元
2. 如果變成K+1名員工去晚餐,平均分攤總餐費.每個人分擔的餐費則變成18元

由條件1得:總餐費=19K
由條件2得:19k/k+1=18
1+2得:K=18
總餐費就為18*19=342
答案為(C)

條件二有點小小錯誤，以紅色標出來了
記得在做條件二時不要將條件一帶進來，不然一下子忘掉會去選(B):P

設總餐費為C，所以重寫後為C/k+1=18
而條件一是C=19*k
所以合併後可解:D

[chris8888]

yeah , 最好這樣

先假設Total Cost => TC

(1). TC = 19K insufficient

(2). TC = 18(k+1) insufficient

1) + 2), 19k=18k+18 => k=18 sufficient