[求助]战友们，求助两道PREP 1 里面的题~~

xin861123

40.   5629-!-item-!-187;#058&004684

Six machines, each working at the same constant rate, together can complete a certain job in 12 days.  How many additional machines, each working at the same constant rate, will be needed to complete the job in 8 days?

 

(A) 2

(B) 3

(C) 4

(D) 6

(E) 8

48.   6225-!-item-!-187;#058&004914

A certain city with a population of 132,000 is to be divided into 11 voting districts, and no district is to have a population that is more than 10 percent greater than the population of any other district.  What is the minimum possible population that the least populated district could have?

 

(A) 10,700

(B) 10,800

(C) 10,900

(D) 11,000

(E) 11,100

我不是很懂怎么做~~请求帮助下~~

干渴小兽

1，

6台机器乘以constant rate 再乘以 12天  等于  x台机器（要求的数）乘以constant rate 再乘以8天

求出x 减去6台 就是 新增加的啦！

2，极限法

x + 10*110%x=13200

求出11000

不知道对不对哈 愿意和你讨论，本人不是牛人，不要笑话我哈

michael_mei

赞同楼上做法

1）选B

2)选D