manhattan数学~求教(抱歉，改正之前的无法显示贴)

蜗涡Joey

刚刚做完的manhattan数学42…都没听说过有人到这个分数的，我不行了！
问题~

1.If a jury of 12 people is to be selected randomly from a pool of 15 potential jurors, and the jury pool consists of 2/3 men and 1/3 women, what is the probability that the jury will comprise at least 2/3 men?
24/91  45/91  2/3  67/91  84/91

连题目都看不懂~什么是will comprise at least？


2.How many factors does 36² have?
2 8  24  25  26

写成2^4*3^4可不可以~？那然后呢？

3.Miguel is mixing up a salad dressing. Regardless of the number of servings, the recipe requires that 5/8 of the finished dressing mix be olive oil, 1/4 vinegar, and the remainder an even mixture of salt, pepper and sugar. If Miguel accidentally doubles the vinegar and forgets the sugar altogether, what proportion of the botched dressing will be olive oil?

15/29  5/8   5/16  1/2  13/27

我弄出来8/9?
遇到这种题这么长已经晕了！要怎么面对~



4.If a and b are positive integers such a/b=2.86, which of the following can be a divisor of a?
10  13  18  26  50

看起来好熟悉~但是就是做不出来，能不能找特殊值？


忘记经过的朋友帮忙~感激！