Solution:
we are given that

This equation shows how the time required to screen-print a batch of shirts is related to the number of shirts in the batch.
Here
s represents the number of shirts.
t represents the time required to screen-print the shirts.
It takes 17 minutes to screen-print a batch of shirts.
we have been asked to find how many shirts are in the batch?
To find this we will substitute the value of t=17 and we will work out the value of S.

Hence there is one shirt in the batch.