Cooper uses 7 * 3 = <<7*3=21>>21 nails for each birdhouse.
He can make 89 / 21 = <<89/21=4.24>>4 birdhouses.
Therefore, Cooper can make 4 * 12 = $<<4*12=48>>48 selling birdhouses. Answer: \boxed{48}.
For each birdhouse, Cooper uses 7 pieces of wood and some nails. He uses 3 times the number of nails as pieces of wood for each birdhouse. He sells each birdhouse for $12. If Cooper has lots of wood, but only 89 nails, how much money can he make selling birdhouses?
1 answer