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=<T>multiply(1.5, 128)=192.0 ounces
He drinks 96/2=<T>divide(96, 2)=48.0 ounces of coffee a day
So he drinks the coffee in 192/48=<T>divide(192, 48)=4.0 days
So in 24 days he makes 24/4=<T>divide(24, 4)=6.0 batches
That means he spends 6*20=<T>multiply(6, 20)=120 hours making coffee
