Prep上的數學題 請教!!

vegachang

A certain city with a population of 132000 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 minumum possible population that the least populated distruict could have?    答案: 11,000

Six countries in a certain regin sent a total of 75 representatives to an international cogress, and no two countries sent the same number of representatives of the six countries, if Country A sent the second greatest number of representatives, did Country A send at least 10 representatives?
 (1) one of the six contries sent 41 representatives to the congress
 (2) contry A sent fewer than 12 representatives to the congress.
答案是 E, 雖然求不出解 但我想知道這類的題目 該怎麼分析

On the number line, the distance between X and Y is greater than the distance between X and Z. Does Z lie between X and Y on the number line?
  (1) XYZ < 0
  (2) XY < 0
一樣答案是 E,  但我不知道從何分析起

wenjie87

A certain city with a population of 132000 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 minumum possible population that the least populated distruict could have?    答案: 11,000

132000/11=12000
假设最低那个组分出去的人为X,那么这个X可以被另外10个组共同承担.
12000+X/10=(12000-X)*(1+10%)