Question 813303
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Hi,
Mark drove 168 miles on 5 gallons of gas.
how far can he travel on a 13 gal full tank
Let x represent the distance he can travel on a full tank 
Questions Sets Up the Proportion
{{{5/168 = 13/x}}}   |  Cross Multiplying to solve
  {{{5*x = 13*168}}}
  {{{x = 13*168/5}}}