prep-T2-DS Q98 & PS Q5

[hsinyang]

98. Is x+y<1 ?

(1)x<8/9
(2)y<1/8
Ans.E

5. Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its own constant rate, a second machine seals k cartons in 4 hours. If the two machines, each working at its own constant rate and for the same period of time, together sealed a certain number of cartons, what percent of the cartons were sealed by the machine working at the faster rate?

(A) 25%
(B) 33 1/33%
(C) 50%
(D) 66 2/3%
(E) 75%
Ans.D

請問這2題分別要如何解呢?

[scottkidd]

98.
(1)x<8/9
(2)y<1/8

1/8比1/9還大，1/9+8/9=1，所以1/8+8/9>1，所以這個式子有可能大於也可能小於1

5.
發問前請先搜尋一下：
http://www.formosamba.com/phpBB3/viewtopic.php?t=11417

[hsinyang]

謝謝你的解答!
不過PS的題號有點不一樣所以沒有瀏覽到
下次會注意的!!