Houston Astros First-Place Eliminiation Scenario
Houston must win 18 more games (44 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Houston finishes in first place with 44 wins:

Team             W	L	PCT	GB
Houston          44	118	0.272	0.00
Seattle          43	119	0.265	1.00
Texas            43	119	0.265	1.00
Los Angeles      43	119	0.265	1.00
Oakland          43	119	0.265	1.00

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Seattle          29	21	112	0.580	0.0
Houston          26	25	111	0.510	3.5
Los Angeles      25	25	112	0.500	4.0
Texas            25	27	110	0.481	5.0
Oakland          22	30	110	0.423	8.0

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 7 additional game(s) against Los Angeles and loses 3.
Houston wins the series 9 games to 4.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Houston currently has 0 win(s) against Oakland and 0 loss(es).
Houston wins 2 additional game(s) against Oakland and loses 11.
Houston loses the series 2 games to 11.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Houston currently has 2 win(s) against Seattle and 3 loss(es).
Houston wins 5 additional game(s) against Seattle and loses 3.
Houston wins the series 7 games to 6.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Houston currently has 2 win(s) against Texas and 2 loss(es).
Houston wins 4 additional game(s) against Texas and loses 5.
Houston loses the series 6 games to 7.
Houston wins 0 additional game(s) against teams outside the division and loses 71.

Los Angeles currently has 4 win(s) against Oakland and 0 loss(es).
Los Angeles wins 5 additional game(s) against Oakland and loses 4.
Los Angeles wins the series 9 games to 4.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 72.

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 72.

Los Angeles currently has 0 win(s) against Texas and 3 loss(es).
Los Angeles wins 4 additional game(s) against Texas and loses 6.
Los Angeles loses the series 4 games to 9.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 72.

Oakland currently has 3 win(s) against Seattle and 4 loss(es).
Oakland wins 0 additional game(s) against Seattle and loses 6.
Oakland loses the series 3 games to 10.
Oakland wins 0 additional game(s) against teams outside the division and loses 76.

Oakland currently has 5 win(s) against Texas and 2 loss(es).
Oakland wins 6 additional game(s) against Texas and loses 0.
Oakland wins the series 11 games to 2.
Oakland wins 0 additional game(s) against teams outside the division and loses 76.

Seattle currently has 5 win(s) against Texas and 1 loss(es).
Seattle wins 0 additional game(s) against Texas and loses 7.
Seattle loses the series 5 games to 8.
Seattle wins 0 additional game(s) against teams outside the division and loses 80.

# Houston Astros' magic number
# Houston's magic number
# Astros' magic number
# MLB Playoff Race