Tom decides to renovate a house.  There are 3 bedrooms and each bedroom takes 4 hours to renovate.  The kitchen takes 50% longer than each bedroom.  The living room took twice as much time as everything else combined.  How long did everything take?
The kitchen took 4 * .5 = <T>multiply(4, 0.5)=2.0 hours longer than the bedrooms
So the kitchen took 4 + 2 = <T>add(4, 2)=6 hours
The bedrooms took 3 * 4 = <T>multiply(3, 4)=12 hours
So the kitchen and bedrooms combined took 12 + 6 = <T>add(12, 6)=18 hours
The living room took 18 * 2 = <T>multiply(18, 2)=36 hours
So everything took a total of 18 + 36 = <T>add(18, 36)=54 hours
