user: Question: What is the sum of the losses by the montreal hockey club, who have more than 15 Goals Against?
Columns: ['Team', 'Games Played', 'Wins', 'Losses', 'Ties', 'Goals For', 'Goals Against']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Montreal Hockey Club', 8.0, 5.0, 3.0, 0.0, 25.0, 15.0]
SQL:

assistant: SELECT SUM("Losses") FROM "Table" WHERE "Team" = 'montreal hockey club' AND "Goals Against" > 15.0;