Question

Larry painted forty feet of fencing in two point five hours. At that rate, how many feet of fencing can Larry paint in 8 hours?

sixteen feet

one hundred twenty feet

one hundred twenty-eight feet

one hundred sixty feet

Answer 1

set it as a fractional ratio, simplify and multiply to eliminate uneccessary units
\[\frac {40 [ft]}{2.5 [hrs]}=\frac{16[ft]}{1[hr]}\]
\[\frac{16[ft]}{1\cancel{[hr]}}\times 8 \cancel{[hrs]}=128ft\]