A:
Normally, for a motion to be adopted, it requires the affirmation of a specified portion of those voting.
For example, if the membership of the club was 100, and 20 are in attendance at a meeting (assuming a quorum), and a motion requiring a majority vote receives 5 affirmative votes and 4 negative votes with 11 abstentions, the motion is adopted.
The abstentions have no effect on the outcome.
Occasionally, the vote required is stipulated as a specified portion of those in attendance.
Using the above example, the motion would fail because only 5 of the 20 members present voted for it.
The abstentions would act as negative votes.
Rarely, the vote required is stipulated as a specified portion of the membership.
Again using the above example, the motion would fail because only 5 of the 100 members voted for it.
The abstentions and absentees would act as negative votes.
See RONR pp. 397-98.