问一道数学JJ...答案好象给的不是很明白...20号就考了...

Hingis

30       4 jars, each with equal water in the beginning --> move the water so that the ratio is 1:6:5:4, what fraction of water is moved?

sscsxl：假设开始每个都是4 相当于从4444à1654  只把第一个jar中的2给了第二个jar 然后第一个又把1给了第三个
                就达成了
                相当于只有第一个jar动了3  总的是16 所以答案应该是3/16

29号考友反应没有3/16的选项，是3/4

30号机经：这个确认选3/4, 假设初始为4，需要从4里面移动3，所以是3/4

我觉得答案给的不是很清楚,希望可以帮助一下我......20号就考了......

geekland

If you add up the ratio, then you get 16, divide by 4 you get 4 as the average , which means all four  jars have same amount of water at the beginning. Then the amount of water in the first jar moved is 4-1=3   =>  3/4 is the final answer.

However, it is just for your information, you may find a better one. Cheers!

Hingis

If you add up the ratio, then you get 16, divide by 4 you get 4 as the average , which means all four  jars have same amount of water at the beginning这句话不是很明白啊．．．题目中已经说了水开始是一样多的．．怎么会which means...

然后就是Then the amount of water in the first jar moved is 4-1=3   =>  3/4 is the final answer. 为什么可以通过第一个jar就知道全部移出了多少呢？还有就是4仅仅是一个比率，为什么可以用来加减？如果用四减去其他的比率不就是负的吗？

哎哟实在很混乱阿....希望可以解释一下....

gundam00

开始是4 4 4 4

然后第一个4给了第二个2，第三个1，就变成1 6 5 4了

那么就移动了3，移动比例就是3/4

jeromejy

纠结之处就在于总数是算4还是16，我觉得题目要出3/4和3/16不会同时出现的，所以清除思路就可以了