页 is a kneeling figure with an oversized head — the radical of heads and pages. 题 originally meant the forehead, then the heading written at the top of a text, then the question posed under that heading. Topics are foreheads of essays.
做题 'doing problems' is the daily bread of Chinese schooling — entire bookstores sell nothing but 题库 question banks. 跑题 'running off the topic' is what teachers write in red when your essay's forehead and body don't match.
What IS 是 written at the head 页 of the page — the QUESTION.
没问题 'no problem' is among the first phrases every visitor learns — and 题 hides inside it, a question already answered.