Upto high school, before answering any question in the exam we used to write "Ans to the q-no:1" (Answer to the question number 1). But then our English teacher told us to write "The ans to q-no:1" (The answer to question number 1). Most students use the former though. Which one is better/grammatically correct?
Edit: We use these acronyms because writing the whole sentence is cumbersome since we have to write it so often. Teachers are used to such acronyms.