Task: Question Answering
Input (English): Problem: a certain car traveled twice as many miles from town a to town b as it did from town b to town c . from town a to town b , the car averaged 10 miles per gallon , and from town b to town c , the car averaged 12 miles per gallon . what is the average miles per gallon that the car achieved on its trip from town a through town b to town c ? 
Options: a ) 11.5 , b ) 9.5 , c ) 13.5 , d ) 10.6 , e ) 14.5
Output (English): d