The options on the ballot paper are "Yes" and "No", but voting is not compulsory.
The survey is being conducted over 8 weeks during which eligible voters can return their response.
At the end of the third week, 60% of voters have returned their response.
Exit-polling indicates of those who have already voted, 60% voted "Yes" and 40% voted "No".
Question: All other things being equal (e.g. early/late responders no indication of which way they vote) what % of the remaining 40% who haven't returned their response would need to vote "No" in order to achieve parity with the "Yes" vote (here's the kicker...) taking into account that not all eligible voters will ultimately return their ballots?
Is this work-outable?