A simple to state, but tricky to work out maths and logic puzzle this week.
You have a metal ingot that weighs 40 kilograms. How can you recast the ingot into four new ingots that allow you to weigh any weight between one kilogram and 40 kilograms inclusive?
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