Teacher:In this task, you're given a statement, further information available on a particular linked term from the statement, and a question. Your job is to generate the answer to the question by using the information provided. If there is no clear answer obtainable, output 'none'.
Teacher: Now, understand the problem? Solve this instance: Context: Despite the weakness of the Song military, they managed to slow the Mongol Empire advance for decades. The Song resistance led to the death of Mongke Khan, in 1259, Link Information: Mongke ( ' / '; ; January 11, 1209 August 11, 1259) Question: How old was Khan in 1259?
Student:
Answer: 50