38.40 for 16 gallons = 2.4 per gallon.
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Well, isn't that just a happy little question? To find the unit rate, you simply divide the total cost of $38.40 by the number of gallons, which is 16. So, the unit rate would be $2.40 per gallon. Just imagine all the places you can go with that gas and the beautiful scenery you'll see along the way.
If that's 348 miles, that's 29 miles per gallon.
It will be able to travel 162 miles...
last month when he used 21 gallons of gas
The answer depends on the rate of change of WHAT? The rate of change of the gas used? the rate of change of the gas left, the rate of change of the range that the vehicle will go? The question is too vague.
It would take 12.4 gallons.