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Answer:
2:1
Step-by-step explanation:
Think of ratios like fractions.
8:4 is a ratio.
If you turn that ratio into a fraction, it will be ---> 8/4
Now, simplify 8/4.
The numerator and denominator share a greatest common factor of 4.
Divide 8 and 4 by 4, which makes the fraction: 2/1
Finally, to put your answer as a ratio again, 2/1 equals to 2:1