[tex]16\ ears\ of\ corn \ picked\ for\ every\ 18\ peppers\\
x\ ears\ of\ corn \ picked\ for\ every\ 9\ peppers\\\\Proportion:\\
16-18\\x-9\\\\cross\ multiplication\\\\
16*9=18x\\
144=18x\ \ \ | divide\ by\ 18\\x=8\\\\
Answer:\ 8\ ears\ of\ corn.[/tex]