There are 36 penguins sunbathing in the snow.  One-third of them jump in and swim in the ocean.  Another one-third go inside the cave to eat their dinner.  How many penguins are still left sunbathing?
This many penguins are swimming: 36/3 = <<36/3=12>>12 penguins.
This many penguins are eating their dinner: 36/3 = <<36/3=12>>12 penguins.
This many penguins are not sunbathing: 12 + 12 = <<12+12=24>>24.
This many penguins are still sunbathing: 36 - 24 = <<36-24=12>>12 penguins.
#### 12