Question

Ratio equivalents to 1:2

Answer 1

2:4  3:6  4:8

Any ratio equals 1:2 as long as you can divide the first number by itself to get 1 and the second number with the 1st number.
Example
2:4
Divide the first number by 2 and you get 1 
Divide the second number by 2 and you get 2
So the ratio equals 1:2


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Answer 2

Some ratios that are equivalent to 1:2 include

2:4
3:6
4:8
5:10

and so on and so forth
hope this helps