Task: Explanation
Input (English): Question: Mary melts a 1 pound chocolate bar and 1 pound of chocolate chips in two pots. Which melts last? 
 Answer: bar
Output (English): It would be hard to get a big chunk of chocolate to dissolve in your milk or hot water. Maybe you could make hot chocolate from some smaller pieces like chocolate chips, but it is much easier to add a powder to your milk. This is because the smaller the pieces are, the more surface area they have.