 This is a mathematical snack from the Association of Teachers of Mathematics for you to enjoy. There is a farmer who lives in a field. So he lives slap bang in the middle of eight fields. So there's his house there. And this farmer is obsessed with the number nine. So every time he looks out a window of his house, he wants to see nine workers working in the field. So the easy way to do that is obviously have three workers working in each field at the top. So there's a total of nine along the top there. And another three workers working in each field down the side there. And another three workers working along the bottom. And obviously another three lots of three workers working down that side there. So in total we've got nine along the top, nine down the side, nine along the bottom, and nine down the other side. And because there are one, two, three, four, five, six, seven, eight fields, there are a grand total of 24 workers. So it gets busy. It gets to harvest time and the workers are getting tired. And they ask the farmer if it would be possible to get somebody else in to give them a hand. So he agreed. But he said, I would like, that's the problem. You can have 25 workers working in total, but I still need to see nine workers working on each side of the house. So your challenge is to get 25 workers in all eight of the fields. And you can do that by changing how many workers are in each field. So for example, you could have four and one and four because that makes nine. And you could have one and four down there because that still adds up to nine. And you could have one and four there because the bottom now adds to nine. And you could have four, one, four down there because that also adds up to nine. So if we check how many workers he's got there, we've got four, eight, 12, 16, 17, 18, 19, 20. So he's got 20 workers all in, but not 25. Okay, so the rules are there must be nine in total across each side around the house. You must have people working in the field. You can't have zero people or no people in there altogether. Okay, and that is it.