Question

Why do some questions have only one answer in brainly? And we cant add an answer to it.

Answer 1

its because every question has time limit to be answered , I'm not sure that what's that time but after the time limit of answering question is over and it has one answer, we can't answer it.

Answer 2

There are two conditions for this:

♦ A user answer a question. There will be one answer. And for 1 week it is only one answer then after that we cannot add answer. It have a limited time for answering i.e 1 week. If the answer is not answered by a user in more than 10 days then it is automatically deleted by brainly.

♦ Two users answered a question. There will be two answers. After 1 week any moderator observed that there is an error in answer, mistake in answer, not enough details then it is deleted by moderator. Hence, there is one answer and time period is over.