posted by kattie .
mr lopez must drive 340 miles to attend an origami seesion.his car averages 28 miles per gallon and so far he has traveled 102 miles. how much gas is left if he wants to continue without stopping ?
340 - 102 = 238
238/28 = 8.5 gallons are needed, but since the original amount of gallons is not known, we don't know "how much gas is left."