Task: Question Answering
Input (English): Problem: the total circumference of two circles is 49 . if the first circle has a circumference that is exactly twice the circumference of the second circle , then what is the approximate sum of their two radii ? 
Options: a ) 7.8 , b ) 6.0 , c ) 6.7 , d ) 9.7 , e ) 18.0
Output (English): a