Answer:
5 shirts.
Step-by-step explanation:
Let x be the total number of shirts.
We have been given that each shirt needs 8 buttons, so number of button on x shirts would be
.
We are told that together the tailors attach 80 buttons. We can represent this information in an equation as:



Therefore, both tailors completed 10 shirts.
Since they split the work evenly, so Timor will complete half of the 10 shirts that is 5 shirts.
Therefore, Timor completed 5 shirts.