John drinks 1.5 gallons of water a day.  How many quarts does he drink a week?
How many quarts does John drink a day? ** He drinks 1.5*4=<<1.5*4=6>>6 quarts a day
How many quarts does John drink a week? ** That means he drinks 6*7=<<6*7=42>>42 quarts a week
#### 42