On the 5th of May there will be a national referendum on whether we should switch to the Alternative Vote system, also known as the Instant Run-off system. In AV voters rank candidates in preference order and in each round of counting the candidate with the lowest pile of votes drops out and their pile is re-allocated to the other candidates.
Here's a quiz.
In the first round of counting the following results are seen:
Candidate A: 100 first preference votes
Candidate B: 99 first preference votes
Candidate C: 99 first preference votes
Question: what happens next?