Given data:
The initial set-up time is a=14 min.
The screen-printing time per shirt is b=5 min.
The expression for the total time is,
[tex]a+bx=49[/tex]Substitute the given values in the above expression.
[tex]\begin{gathered} 14+5x=49 \\ 5x=35 \\ x=7 \end{gathered}[/tex]Thus, the numbers of shirts are 7 in the batch.
