Given the stream of consciousness rationale, provide a reasonable question and answer. Rationale: If sharks are twice the number of stingrays, then the number of sharks at the aquarium is 2 sharks / stingray * 28 stingrays = 56 sharks. The number of fish in the tank is 56 sharks + 28 stingrays = 84 fish.
 The question and answer:
user
At the aquarium, there are twice as many sharks as stingrays. If there are 28 stingrays, how many fish are there?
The answer is 84
assistant