if your car gets $29 miles per gallon, how much does it cost to drive 340 miles when gasoline costs $2.60 per gallon?

Question

I have tried to answer this math problem 10 times and still seem to get it wrong. Somebody please help me.!!

Answer 1

340 miles ÷ 29 miles/gal = 11.72 gallon

 

11.72 gallon * $2.60/gallon = $30.47

Answer 2

Set it up as a proportion.  If it costs $2.60 to go 29 miles, how much does it cost ($x) to go 340 miles?

 

29 miles         340 miles

------------  =  -------------

  $2.60              $x

 

Cross multiply (means and extremes):

 

29x = 340*($2.60)

 

x = 340*($2.60)/29

 

Solve for x, the cost of gas to go 340 miles.

Answer 3

Hi Brandon,

 

Can you calculate how many gallons it takes to drive that many miles?