Question

What is the ratio of 0​

Answer 1

Answer:

the ratio of zero is also a zero

Answer 2

Answer:

As was mentioned by others, it is undefined. If you want the ratio "of A to B" then this means you want |A|/|B|. E.g. the ratio of Boys to Girls is the number of boys divided by the number of girls. Hence, the ratio makes sense if and only if |B| is not zero, since division by 0 is undefined.