This puzzle does not require math skills but some imagination and visual skills. Assuming you have not seen this problem before, that is. One of the visual skills required is getting past my terrible drawing abilities 🙂
So, there is a painting with a string attached on the top two ends as shown in the picture. And there are two nails on the wall horizontally separated. (the separation distance does not matter).
Can you hang the painting with the string in a way that if any one of the nails come off, the painting will fall down to the ground?
Of course, the painting needs to actually hang from the nails using the string.