Troy's truck has a $30 gallon$ gas tank and gets an average of $21 miles$ per gallon.
Write an equation to represent the amount of gas in Troy' s truck after driving a certain number of miles (assuming he starts with a full tank).
Define your variables.

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Solution

Write an equation to represent the amount of gas in Troy' s truck after driving a certain number of miles.
Troy's truck has a $30 gallon$ gas tank and gets an average of $21 milespergallon$
Writing an equation to represent the amount of gas in Troy' s truck after driving a certain number of miles :
Let, truck used gallons of gas tank be $x gallons$
Given, Trucks travel distance per gallon = $21 miles$
Distance travelled by truck using $x gallons$ = $21 x$
Hence, gallons of gas tank left = $(30 - x) gallons$

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Troy's truck has a 30gallon gas tank and gets an average of 21miles per gallon. Write an equation to represent the amount of gas in Troy' s truck after driving a certain number of miles (assuming he starts with a full tank). Define your variables.

Troy's truck has a $30 gallon$ gas tank and gets an average of $21 miles$ per gallon.
Write an equation to represent the amount of gas in Troy' s truck after driving a certain number of miles (assuming he starts with a full tank).
Define your variables.