Sean is filling his truck with gasoline. He knows the total cost, c, will be proportional to the number of gallons of gasoline, g, that he puts into the gas tank. After putting 8.5 gallons in
the tank, the cost is $23.63.
(a) Find the ratio of the cost to the gallons as (b) What is the real world meaning of your
a unit rate. Show the division as a fraction answer in (a)?
and then state the answer with appropriate
units.
(c) If c is the cost and g is the number of
gallons bought, write a proportion
involving c and g and then solve it for c.
(d) If Sean puts 17 gallons of gasoline into
his truck, what is his cost? Justify.