elementary logic

Lemma 1: One smoked cigarette shortens life by 2 minutes. Lemma 2: One bottle of alcohol shortens life by 4 minutes. Lemma 3: The working day shortens life by 8 hours. Lemma 4: A bottle of brandy early in the morning shortens the working day by 8 hours.

  Theorem 1: It follows from Lemmas 2, 3 and 4 that drinking a bottle of brandy early in the morning before work gives you 7 hours and 56 minutes of life.