Lucas' father offers to pay him $2 for each window in the house that he cleans. Each floor of Lucas' house has 3 windows; Lucas lives in a 3-story house. To get Lucas to finish the job faster, his father tells him that he will subtract $1 for every 3 days that pass without Lucas finishing the job. In 6 days, Lucas finishes cleaning all the windows in the house. How much will his father pay him, in dollars?
Lucas cleans a total of 3 floors * 3 windows/floor = <T>multiply(3, 3)=9 windows.
The windows cleaned earn Lucas 2 dollars each, so Lucas earns 9 windows * $2/window = $<T>multiply(9, 2)=18
For taking 6 days to clean, Lucas' father subtracts 6 days / $3/day = $<T>divide(6, 3)=2.0
In total, Lucas' father will pay him $18 - $2 = $<T>subtract(18, 2)=16
