six in 10 为什么不是 six in ten ?

Even six in 10 Americans agreed the U.S. economy was having a negative impact abroad.
不要说是偶然，我见过不止一次了。
six in ten是不会有人说错，但是怎么就没见6 in ten这种写法吗？
其实我感觉是10 后面接名词 Americans 比较习惯，在没有前面six in的时候 ，表示多少数量的什么习惯用阿拉伯数字，前面加上了six in ，还延续了这种习惯。

SR不是七代车(Six Revolution) my target was 10 stone and i lost 2 stone 21bs in six months. Class will start in(on) six minutes Please _____ at six in the morning. “a six-storeyed building”还是“a six-storey building”?为什么？ We were six in number.It was up tp me to get____ movingA.six of usB.the six of usC.our sixD.we six she deicided to return the blende she had borrowed from me six months before为什么不是用ago I will be taller in six years' time. 对不对？？ she __up at six in the morning yesterday. There are six play in our team对吗