Jack makes his own cold brew coffee.  He makes it in batches of 1.5 gallons.  He drinks 96 ounces of coffee every 2 days.  It takes 20 hours to make coffee.  How long does he spend making coffee over 24 days?
He makes it in batches of 1.5*128=<<1.5*128=192>>192 ounces
He drinks 96/2=<<96/2=48>>48 ounces of coffee a day
So he drinks the coffee in 192/48=<<192/48=4>>4 days
So in 24 days he makes 24/4=<<24/4=6>>6 batches
That means he spends 6*20=<<6*20=120>>120 hours making coffee
#### 120