Answer
4 bags
Work Step by Step
Set up an equation using conversion factors based on the information given. Note the way the units cancel out in the numerators and denominators.
$\frac{1\ momento}{1\ guest}\times\frac{1.5\ oz}{1\ momento}\times\frac{1\ bag}{5\ lb}\times\frac{1\ lb}{16\ oz}\times 200\ guest=\frac{300}{80}\ bags=3.75\ bags$
Round up to the next full bag to have enough mints.
