In this task, you're given a context, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both context and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the context or linked information.

[Q]: Context: They served on opposite sides of the American Civil War: Meagher serving with the Union, Link Information: John Mitchel (; 3 November 1815 Answer: 46
[A]: How old was Mitchel when the event where he served with the Union began?


[Q]: Context: also taught at the Link Information: none Answer: none
[A]: How many students are enrolled at the school where Thomas taught?


[Q]: Context: Johnson was hired along with former offensive coordinator Jimmy Raye by San Francisco head coach Mike Singletary on February 6, 2009. Link Information: Michael Singletary (born October 9, 1958) Answer: 50
[A]:
How old was Mike Singletary when he hired Johnson?