Generate word problem on ratios suitable for grade 10
An aquarium has a total of 120 animals, out of which 40 are amphibians and the rest are fish. What is the ratio of amphibians to the total number of animals in the aquarium?
Instruction: Generate word problem on ratios suitable for grade 10
Context: 
Response: An aquarium has a total of 120 animals, out of which 40 are amphibians and the rest are fish. What is the ratio of amphibians to the total number of animals in the aquarium?