Alang runs a farm stand that sells blueberries and grapes. Each pound of blueberries
sells for $1 and each pound of grapes sells for $3.50. Alang sold 20 more pounds of
grapes than pounds of blueberries and made $182.50 altogether. Write a system of
equations that could be used to determine the number of pounds of blueberries sold
and the number of pounds of grapes sold. Define the variables that you
the system.