Prep-2-5, 9,29, 116

kic345

麻烦各位 NN  指导

9.    1662-!-item-!-187;#058&002391
Equal amounts of water were poured into two empty jars of different capacities, which made one jar  1/4 full and the other jar 1/3  full.  If the water in the jar with the lesser capacity is then poured into the jar with the greater capacity, what fraction of the larger jar will be filled with water?

(A)  1/7
(B)  2/7
(C)  1/2
(D)  7/12
(E)  2/3


ANS: C

larger jar 是说哪个阿？ 不是两个equal amout的 jar 吗？
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29.    3873-!-item-!-187;#058&003594
If n denotes a number to the left of 0 on the number line such that the square of n is less than  1/100, then the reciprocal of n must be

(A) less than -10
(B) between -1 and 
(C) between   and 0
(D) between 0 and 
(E) greater than 10


ANs : A

我的思路是这样 ： -1/10 < n < 1/10  &  n < 0
请问哪边有错误阿

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116.    12050-!-item-!-187;#058&008561
A certain manufacturer of cake, muffin, and bread mixes has 100 buyers, of whom 50 purchase cake mix, 40 purchase muffin mix, and 20 purchase both cake mix and muffin mix.  If a buyer is to be selected at random from the 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?

(A)  1/10
(B)  3/10
(C)  1/2
(D)  7/10
(E)  9/10
 

ANS : B




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5.    1353-!-item-!-187;#058&000886
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 1/3 %
(C) 50%
(D) 66 2/3 %
(E) 75%


ANS : D

what percent of the cartons were sealed by the machine working at the faster rate?
请问这句话的意思是什么 ？
感觉都是题目解读有错...

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只剩3天，OG做完后，
Q已经两个月没碰...考出来很惨...

这几天是应该多做pp破解吗？


感谢各位 XDJM

ruru8ruru8

5.

what percent of the cartons were sealed by the machine working at the faster rate?

是说快的机器干的活占快的机器干的活加慢的机器干的活的百分比

快/快+慢
        分子k/4 分母
        k/4 + k/8 => 2/3