关于数学221的疑问

zhaoyiwei1 · 发表于 2010-12-7 01:02:58

221. 一个人连续工作4天，休息2天，再连续工作4天，休息2天，如此循环，这个人工作了一年之后，问317天（貌似是这个值。。具体的值被6除余5好像）ago是这个人的生日，他在生日那天是否工作了

1）今天是他连续第二个休息日（我理解是今天是他休息的两天中的第二天，也就是说明天要工作）

2）相对于今天来说，5 days ago（也不确定）他是工作的

这题讨论稿好像错了,我觉得选D

因为317除以6余5,而条件2说的是5天前是工作的

如果是其他数字确实无法确定,但是5天前的话是工作的,317天前与5天前正好是整数个工作循环周期,所以应该可以确定317天前是在工作,考试时候还要自己看317这个数字除以6的余数,和条件2的天数

现在困惑是五天前是什么概念，例如周日的五天前到底是周二还是周三？如果是周二那第二个条件就不行（那样就会有四种情况），还请高人给指点一下

sdcar2010 · 发表于 2010-12-7 02:20:46

Let's do it this way:

Six days ago, the worker is doing exactly the same thing he is doing today. 5 days ago, the worker was doing what he is going to do tomorrow. So 317 days ago, the worker was doing what he is going to do tomorrow.

Therefore
1) If today is the second rest day, tomorrow the worker will work. So the worker worked on his birthday
2) If the worker worked 5 days ago, he is going to work tomorrow. So the worker worked on his birthday.

Both conditions are sufficient.

zhaoyiwei1 · 发表于 2010-12-7 12:41:58

那请问就是周日的五天前是周三？我想确定一下

sdcar2010 · 发表于 2010-12-7 12:48:44

If today is Sunday, then 5 days ago is Tuesday since 7 days ago is Sunday.

sdcar2010 · 发表于 2010-12-7 12:50:05

Remember, in the stimulus, they use six days as a "week". Not seven days!

关于数学221的疑问

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块