Generate word problem on ratios suitable for grade 10
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Generate word problem on ratios suitable for grade 10

### 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?