2 solutions because you have 2 different equations
3 1/2 divided by 5. this would give you .7 pounds of candy per person
Sum of a finite geometric series=a(r^(n) -1)/(r -1)
or
sum of a finite geometric series=a(1 - r^(n))/(1 - r)
the Smiths would spend a total of $2928.2 on clothing in 4 years
I estimated the answer to be 18,000
Without estimation the answer would be 18,109