TASK DEFINITION: In this task you're given a question and you have to paraphrase the question to create the output question while retaining the meaning of the original question.
PROBLEM: How do you get rust off of a motorcycle chain?

SOLUTION: How often do I need to clean the chain on my motorcycle?

PROBLEM: How can you determine the chemical formula for anhydrous copper sulfate?

SOLUTION: How can you determine the chemical formula for magnesium and copper sulfate?

PROBLEM: Which is the best book of chemistry class 11 and 12?

SOLUTION:
Which book is the best for chemistry for class 12?