问道prep上的数学题！

angel1993627 · 发表于 2015-7-11 10:56:25

36. 4841-!-item-!-187;#058&004235
In a certain deck of cards, each card has a positive integer written on it. In a multiplication game, a child draws a card and multiplies the integer on the card by the next larger integer. If each possible product is between 15 and 200, then the least and greatest integers on the cards could be
NO C
(A) 3 and 15
(B) 3 and 20
(C) 4 and 13
(D) 4 and 14
(E) 5 and 14

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

cicitotheblue · 发表于 2015-7-11 11:31:28

48.其实一种情况可能是有10个区人口都一样，而且每一个比最少人口的区多10% 再设最少人数的区为x，可以列出等式

(1+10%)+x=12x=132000
x=11000

sunshj404 · 发表于 2015-7-29 20:48:44

第一个应该是选择D吧，x*(x+1)>15，且y(y-1)<200,x=4,y=14

wolk8 · 发表于 2015-7-30 10:34:03

第二题已经解答了，第一题楼主不如回去确认一下不是C？
题目意思是选一个数乘上相邻的大的那个整数吧？应该是4和13的。。。而且稍微搜索了一下其他地方这道题也都选C

问道prep上的数学题！

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