Guest Comedian Simon Evans pits common sense against Dara's big maths brain as they battle it out to solve real life problems. Professor Marcus Du Sautoy sets the questions. Today's theme is, 'Finding your way'.

Guest Comedian Simon Evans pits common sense against Dara's big maths brain as they battle it out to solve real life problems. Professor Marcus Du Sautoy sets the questions. Today's theme is, 'Finding your way'.