Lindsey owns 4 + 5 = <<4+5=9>>9 cars.
Carol owns 2 * 5 =<<2*5=10>>10 cars.
Susan owns 10 - 2 = <<10-2=8>>8 cars.
They all own 5 + 9 + 10 + 8 = <<5+9+10+8=32>>32 cars.
#### 32