Question

I'm trying to solve this problem but I can't quit figure out how to set it up? An 8ft length of 4 inch wide crown molding costs $12. how much would it cost to buy 104 ft of crown molding?

Answer 1

Notice that the crown molding has the same width, no matter the lenght. So those 4 inches can be ignored to solve the problem.

Now, let's use a rule of three:

This way,

$x=\frac{12\cdot104}{8}\Rightarrow x=156$

Buying 104 ft of crown molding would cost $156