At the aquarium, there are twice as many sharks as stingrays. If there are 28 stingrays, how many fish are there?
If sharks are twice the number of stingrays, then the number of sharks at the aquarium is 2 sharks/stingray * 28 stingrays = <<2*28=56>>56 sharks
The number of fish in the tank is 56 sharks + 28 stingrays = <<56+28=84>>84 fish
#### 84