Task: Question Answering
Input (English): Problem: a certain fruit stand sold apples for $ 0.70 each and guava for $ 0.50 each . if a customer purchased both apples and bananas from the stand for a total of $ 6.30 , what total number of apples and bananas did the customer purchase ? 
Options: a ) 12 , b ) 13 , c ) 11 , d ) 14 , e ) 5
Output (English): c