13.technicians equally receive defective products from a box containing 88 defective products, if the number of the rest of defective products in the box less 2 than the number of technicians, then the following cannot be the number of technicians?
5 12 16 9 18 My ans: 12
16为何不对, 按我的列式有2解: 88+2 =NO.*n, so 12, 16都无法被整除
16、 2X X 2X 4 1
0 1 5 10 25
给了个如上表格，第一行表示小组中会见顾客的员工数，第二行表示每人见客人的时间。还解释了如其中有4个员工每人会客的时间为10 个小
时，求总员工数？
1） 平均每个员工每人会客4小时；2）有一半的员工会客时间小于或等于1小时
－－－－－－－－－－－－－－－
[确认]D分别充分
2)为何充分, 可否解释一下题意.
3. X1＝3 其后Xn＝2Xn_1-1，问x20-x19
－－－－－－－－－－－－－－－
[确认]如果傻瓜硬算，每一项都算出来，10分钟都不够。应该得：2^18(X1-1)＝2^19
该如何总结出列式而无需应算.
96,一个人存钱x,存n年,1/4复利,利率是5%,问n年以后有多少钱
可否解释一下题意
213. 一个表格，两个学校分别有a个人和b个人， median分别是85和75，mean分别是78和82，问两校合并后的median和mean那个大？
1）a+b=79
2）a=36，b=43
[确认] E
B or E????
273.求某人在另一本金和利率情况下同一时间的利息收入?
旧JJ：一人投资400刀取得20刀利息, 按4% 单利计算.问如果投资800刀,6%利率,会得多少利息
[讨论] 20/400=5%, 为什么会是单利4%? 不过, 按照他的说法,有:
(800/400)*(6%/4%)*20=60 大刀
20与4%联不起来, 可否解释一下, 如上的算法对吗?
351.denotes the remainder of 3x divided by 2, which of the following is equal to 1?
I. <2x+1>
II.<2x>+1
III. 6x
题目???
368.DS The number of boys in a class and the number of the totle of boys and girls who take the course of biology is shown in the form blew, How many is all the boys and girls in the class.
表格 take biology not take biology totle
-- ------------------------------------------------------------------
boy 28
-------------- ----------------------------------------------------------
girl
-----------------------------------------------------------------------
totle 36
1. There are 15 boys who do take biology
2. The girls in the class is twice as many as the totle of boys and girls who do not take biology
[确认]B
题目???
455.一个人重120，医生开了18的药 ，但是标准的是15的身体需要2的药，问医生的药超过标准多少percent。
[确认](2/16)
题目 或 列式?作者: gmat02 时间: 2002-12-12 20:18
can anybody help on these Q's? thanks a lot作者: hopejie 时间: 2002-12-13 01:31
273.求某人在另一本金和利率情况下同一时间的利息收入?
旧JJ：一人投资400刀取得20刀利息, 按4% 单利计算.问如果投资800刀,6%利率,会得多少利息
[讨论] 20/400=5%, 为什么会是单利4%? 不过, 按照他的说法,有:
(800/400)*(6%/4%)*20=60 大刀
20与4%联不起来, 可否解释一下, 如上的算法对吗?
400*4%*T = 20
800*6%*T = X
so: X = (800/400)*(6%/4%)*20 = 60作者: nimble77 时间: 2002-12-13 04:01
for 3
Xn=2^(n-1)*(X1-1)+1,So X20-X19=X19-1=....
I think no better way to get this formula.
Fortunelly,the formula is simple, so You first get X1 ,X2 and X3 then compare them, you could guess the formula. If you want to make sure, then prove it is correct for the known formula. then done.作者: nimble77 时间: 2002-12-13 04:20
for 13
you are right, Maybe one answer should be 15 other than 16 or 12作者: David0822 时间: 2002-12-13 11:08
