Answer:
To find the ratio of the number of astronauts in outer space to the number of astronauts on Earth, we divide the number of astronauts in outer space by the number of astronauts on Earth:
Ratio = (Number of astronauts in outer space) / (Number of astronauts on Earth)
Given that there are 12 astronauts in outer space and 3 astronauts on Earth:
Ratio = 12 / 3 = 4
So, the ratio of the number of astronauts in outer space to the number of astronauts on Earth is 4:1.
