we get that after 5 minutes George has 15 flowers. So the equations that model the situation is
[tex]\begin{gathered} 3t+4t+15=190 \\ 7t=190-15=175 \\ t=\frac{175}{7}=25 \end{gathered}[/tex]as the time is 25 minutes we get that George made
[tex]25\cdot3+15=75+15=90[/tex]George made 90 flowers