Answer:
($3.75)n ≤ $20
Step-by-step explanation:
Represent this number by n.  Then the total purchase price can be represented by ($3.75)n ≤ $20, which is appropriate because Cooper can't spend more than $20.
The desired inequality is ($3.75)n ≤ $20.  If a solution is desired, divide both sides by $3/75):
 Â
    $20
n ≤ ______ = 5 1/3.
   $3.75
Cooper can purchase up to 5 whole packs of paper and have a bit of money left over.