Oakland Athletics First-Place Eliminiation Scenario
Oakland must win 19 more games (41 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Oakland finishes in first place with 41 wins:

Team             W	L	PCT	GB
Oakland          41	121	0.253	0.00
Seattle          41	121	0.253	0.00
Houston          41	121	0.253	0.00
Texas            41	121	0.253	0.00
Los Angeles      40	122	0.247	1.00

Tie breakers
Oakland wins the series with Houston 7 games to 6
Oakland wins the series with Seattle 7 games to 6
Oakland wins the series with Texas 7 games to 6

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Seattle          23	18	121	0.561	0.0
Oakland          22	20	120	0.524	1.5
Houston          21	20	121	0.512	2.0
Texas            22	21	119	0.512	2.0
Los Angeles      17	24	121	0.415	6.0

Next, we show how the remaining series of games plays out in the scenario:

Houston currently has 2 win(s) against Los Angeles and 1 loss(es).
Houston wins 0 additional game(s) against Los Angeles and loses 10.
Houston loses the series 2 games to 11.
Houston wins 0 additional game(s) against teams outside the division and loses 75.

Houston currently has 0 win(s) against Oakland and 0 loss(es).
Houston wins 6 additional game(s) against Oakland and loses 7.
Houston loses the series 6 games to 7.
Houston wins 0 additional game(s) against teams outside the division and loses 75.

Houston currently has 1 win(s) against Seattle and 2 loss(es).
Houston wins 1 additional game(s) against Seattle and loses 9.
Houston loses the series 2 games to 11.
Houston wins 0 additional game(s) against teams outside the division and loses 75.

Houston currently has 0 win(s) against Texas and 0 loss(es).
Houston wins 13 additional game(s) against Texas and loses 0.
Houston wins the series 13 games to 0.
Houston wins 0 additional game(s) against teams outside the division and loses 75.

Los Angeles currently has 0 win(s) against Oakland and 0 loss(es).
Los Angeles wins 7 additional game(s) against Oakland and loses 6.
Los Angeles wins the series 7 games to 6.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 77.

Los Angeles currently has 0 win(s) against Seattle and 2 loss(es).
Los Angeles wins 6 additional game(s) against Seattle and loses 5.
Los Angeles loses the series 6 games to 7.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 77.

Los Angeles currently has 0 win(s) against Texas and 3 loss(es).
Los Angeles wins 0 additional game(s) against Texas and loses 10.
Los Angeles loses the series 0 games to 13.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 77.

Oakland currently has 3 win(s) against Seattle and 4 loss(es).
Oakland wins 4 additional game(s) against Seattle and loses 2.
Oakland wins the series 7 games to 6.
Oakland wins 0 additional game(s) against teams outside the division and loses 82.

Oakland currently has 5 win(s) against Texas and 2 loss(es).
Oakland wins 2 additional game(s) against Texas and loses 4.
Oakland wins the series 7 games to 6.
Oakland wins 0 additional game(s) against teams outside the division and loses 82.

Seattle currently has 5 win(s) against Texas and 1 loss(es).
Seattle wins 2 additional game(s) against Texas and loses 5.
Seattle wins the series 7 games to 6.
Seattle wins 0 additional game(s) against teams outside the division and loses 87.

# Oakland Athletics' magic number
# Oakland's magic number
# Athletics' magic number
# MLB Playoff Race