英语翻译If I give you seven apples,you will have five times as many a_英语解答

英语翻译
If I give you seven apples,you will have five times as many as I would then have.However,if you give me seven apples,we will then both have the same number of apples.How many apples do I currently have?
What has a bed but never sleeps?
第二个能不能讲解一下为什么，

人气：159 ℃　时间：2019-09-27 18:44:37

解答

假如我给你7个苹果,你将拥有的数量是我的5倍,加入你给我7个苹果,我们的数量是一样多,我现在有多少苹果?
设我现在的苹果数为x,你的苹果数为y.则
y+7=5（x-7)
y-7 =x+7
解得,14个,y=28个
第二个是有一个什么床从来不能睡觉.车床,就是加工零件用的床