望高人指点这道题谢了

frando · 发表于 2011-8-28 01:17:11

An even number x divided by 7 gives some qotient plus a remainder of 6. Which of the following, when added to x, gives a sum which must be divisible by 7?
1
3
7
8
13
答案是8，请问下1为什么不行呢? 鄙人智商有限，还望高人道其缘由，小弟感激不尽

tinyhuhu · 发表于 2011-8-28 01:24:54

“an even number x”

tinyhuhu · 发表于 2011-8-28 01:30:50

“an even number x”

-- by 会员 tinyhuhu (2011/8/28 1:24:54)

sorry, 看错了，这不是问题所在，1 or 8都还是满足条件的。题目没错吧？

望高人指点这道题谢了

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