Parliamentary Procedure: Abstentions

I'm wondering if any parliamentary procedure gurus--or anyone, for that matter--can help me resolve something regarding abstaining from voting.

Consider this: There are 60 eligible voters in a club. All 60 are present, and all will cast a vote. They are electing a president--one person gets one vote, with a majority needed to win (not a plurality). There are 2 candidates.

Of the 60 voters, 20 abstain, leaving 40 people to vote for or against.

Question 1) If 20 abstain, then does the majority remain at 31 votes, or does it change to 21 votes?

Question 2) If 30 people abstained, no majority could be reached. What happens in this scenario? A constitutional crisis?

Just curious...

Since there is a quorum, the vote is counted among those who participate.

If I remember my Robert's Rules. I may be wrong.

of a wonderful book called "Robert's Rules of Order." That, along with a copy of "Fowler's Guide to English Usage", the Oxford Dictionary, the Webster's Dictionary, a Thesaurus and a copy of your particular country's style handbook, usually published by the State Department or Secretary of State, are a bare minimum for reference manuals.

Abstentions do not make any difference in the quorum, or in the number of votes needed for passage. The Abstentions are noted as a portion of the vote, i.e., for, against, abstentions.