Answer:
59
Step-by-step explanation:
Let x = length of the rows
we can derive two equations from this question
1. 7x + 3
2. 5x + 19
Since the number of chairs are equal in the two equations :
7x + 3 = 5x + 19
solve for x
2x = 16
x = 8
Substitute for x in either equations
7(8) + 3 = 59
5(8) + 19 = 59