Answer: His speed after four weeks of practice will be 35 wpm.
Explanation:
Since we have given that
Initially he could type = 27 wpm
After one week, he could type = 29 wpm
After two weeks , he could type = 31 wpm
So, According to this pattern, he increases 2 wpm after practicing every week.
So, After three weeks, he could type = 31+2 = 33 wpm
After four weeks of practice, he could type = 33+2 = 35 wpm.
So, his speed after four weeks of practice will be 35 wpm.