A pig is in a field that is an equilateral triangle with sides 100 metres long. The pig is tethered by a rope to one corner of the field and it can graze exactly half the area of the field.
How long is the rope?
As usual you can post your suggested answers as a comment on this website, reply to the post on Facebook, or retweet or reply on Twitter @quizmastershop.
Answer at 9.00 on Monday