请教一句英语twenty hours out of each twenty four

题目

请教一句英语twenty hours out of each twenty four
Edison decided a pattern for his life.It was to work twenty hours out of each twenty four.其中的twenty hours out of each twenty four如何解释,并请说明一下为什么.

答案

一天中的20个小时
out of 是分数的表达方式 如 4 out of 5 就是五分之四
twenty hours out of each twenty four实际上就是24个小时中的20个小时