33 五月二十五 棉裤之后

silencia1025

记得LZ,好像IBT分数 暴高无比。。。。大NN

jessiejie

7. X is a positive integer and the sum of all the units digit is 170 , Y is a integer, and X=10^20-Y, then what might be the value of Y?
请教一下，这题的解题思路是什么呢？完全没ｓｅｎｓｅ阿

-- by 会员 gjjemily (2010/5/25 14:47:34)

Y=2  背答案吧

-- by 会员 恶意 (2010/5/25 16:15:42)

从前几楼的分析看应该是47啊？怎么是2呢？有人有标准答案么？

小货舱

对阿 好像是47哟

jessiejie

6. in a survey of the number of goose, scientists harvest A （数字忘记了)个 eggs and select 2 eggs out of 90% nests have more than 5 eggs, and there are B nests that have 4 eggs. There are no other nests. So what is the total number of nests surveyed ?
let me try no.6 more clearly, this one tests understanding of the whole sentence,   in a survey of the nests of goose, scientists harvest A eggs in a way that they select 2 eggs out of 90% of nests that have more than 5 eggs. and there are B nests that have 4 eggs.

这道题怎么做呢？谁能给个思路？

kissxkiss

问问,kitchen magazine原题是哪个里面得

fydaydayup

设下了超过5个蛋的鸡窝有X个，则0.9X*2+4B=A，求出X，X+B就是总的鸡窝数量了。

关键是题目要读懂，绿色那段话的意思是，科学家按照如下方法收获鸡蛋，鸡窝分两种，五个及五个以上的鸡蛋，和四个鸡蛋，五个鸡蛋的鸡窝的90%才拿鸡蛋，而且每个鸡窝只拿两个，四个鸡蛋的鸡窝就全部拿走。

6. in a survey of the number of goose, scientists harvest A （数字忘记了)个 eggs and select 2 eggs out of 90% nests have more than 5 eggs, and there are B nests that have 4 eggs. There are no other nests. So what is the total number of nests surveyed ?
let me try no.6 more clearly, this one tests understanding of the whole sentence,   in a survey of the nests of goose, scientists harvest A eggs in a way that they select 2 eggs out of 90% of nests that have more than 5 eggs. and there are B nests that have 4 eggs.

这道题怎么做呢？谁能给个思路？

-- by 会员 jessiejie (2010/5/25 23:16:20)

nowwsy

问问,kitchen magazine原题是哪个里面得

-- by 会员 kissxkiss (2010/5/25 23:22:49)

这道题的考古资料是从以前的狗狗里找的。
我做过的gwd确实没见过这题

jessiejie

谢谢45楼的！
哎要是让我自己看，怎么也没办法把这段英文弄明白

xxrjulia

2.2个立方体，每面都是一个数字，1-6，同时抛，问最上方的那一面数字之和是5或者9的概率多少？ 5=2+3=1+4，so the probability could be 1/6 * 1/6 *2*2=1/9, 同理 9=3,6=4,5，p=1/9,so the final answer shall be 2/9.

请问为什么要乘以两次2啊？
谢谢指教

成功GMAT在4月

LZ!  Thanks so much!  We all need you!  I'll come back and contribute after my G on 6/1 in California ... nervous