how can you sum up a text with numbers

In MS Excel if one cell contains text and other number, then they can be added together in 3rd cell by using ampersand sign; and use parenthesis for giving space.
A1= Number A2= 1234 A3= Number 1234 (formula =A1& " "&A2)

i said sum text with date or number you are talking about number its pretty easy to you sum but my point is how can i sum text with number

Let's say A1 = "my date of birth is" A2 = "20/08/1985" so you need a result of in one cell A3 = "my date of birth is 20/08/1985" =A1&" "&TEXT(A2,"dd/mm/yyyy")

you have two ways...
1- = CONCATENATE(A1;A2)
2- = "A1"&"A2"

If you want to sum numbers you would use sum Function.
Such as.
=sum(A1:A10)