Why one cant concatenate?

Question

like ," AWAL is' + 20 'years"

Answer 1

Make your question more specific and clear; mention the programing language including, if possible, your attempt and desired outcome.

Answer 2

If " AWAL is' + 20 'years" is your attempt, you aren't doing it right. Strings need to start and end with the same quote so that is a single string.
"this"+" is "+"three strings"
The above is three strings concatenated together. You can replace one or more strings with variables, but you might need to force concatenation versus addition if you want to use a number first.

Answer 3

your string starts with a double quote and ends in a double quote and reverse for the second.attempting to do this should in logic throw a fatal error