“第几个”用英文怎么说

“第几个”没有一个直接对应的英文词. 翻译时应灵活处理.
林肯是美国第几任总统？
Which term of US President did Lincoln serve as?

那是你们开的第几家店？
Is that the first store you opened?
When did you open that store among all your stores?

我不记得这是我第几次来圆明园了.
I could not remember how many times I have visited Yuan Ming Yuan/The Old Summer Palace/the Gardens of Perfect Clarity.

洛迪丝是麦当娜的第几个女儿?
Is Lourdes Madonna's oldest/youngest daughter?

你在家排行第几?
Are you the oldest/youngest child in your family?

参考资料：
http://art.kaola.cn/u/watt/89579.html
http://thetonyshome.blog.sohu.com/59255009.html

一楼说得对:“第几个”没有一个直接对应的英文词. 翻译时应灵活处理.但用which比较多.

林肯是美国第几任总统？
Which term of US President was Lincoln?

那是你们开的第几家店？
Whi