John takes a 10-minute shower every other day for 4 weeks. If his shower uses 2 gallons of water per minute.  How much water does he use in those 4 weeks?
There are 4*7=<T>multiply(4, 7)=28 days in those 4 weeks
That means he takes 28/2=<T>divide(28, 2)=14.0 showers
So he takes a total of 14*10=<T>multiply(14, 10)=140 minutes of showers
So he uses 2*140=<T>multiply(2, 140)=280 gallons of water
