Answer:
There are 7 chairs in each row.
Explanation:
Hue is arranging some number of chairs. If she arranges them in 6 rows of equal lengths then there will be 3 chairs leftover, or she arranges them in 8 rows of that same length then she requires 11 more chairs. 
Let us assume that there are P numbers of chairs and there are x chairs in each row. 
Therefore, we can write that 
6x + 3 = P ....... (1) and 
8x = P + 11 
⇒ 8x - 11 = P ........ (2) 
Now, from equations (1) and (2) we get, 
6x + 3 = 8x - 11 
⇒ 2x = 14 
⇒ x = 7 
Therefore, there are 7 chairs in each row. (Answer)