Task: Question Answering
Input (English): Question: Joe's age, Joe's sister's age and Joe’s fathers age sums up to a century. When son is as old as his
father, Joe's sister will be twice as old as now. When Joe is as old as his father then his father is twice as old as when his sister was as old as her father.What is the age of father?

 Option A: 40

 Option B: 50

 Option C: 60

 Option D: 70

 Option E: 80
Output (English): Option B