The Tikker is a watch that counts down the years months days hours and minutes to your death. This could be useful if you want to make sure you say the right things in your final moments. Saying your last goodbye to family and friends and also, making sure you have the right amount of time. Along with telling you when you die it tells you the regular time. This is helpful just as any watch would be. I think this is an interesting new piece of technology and could gain a lot  popularity.

fence posts

If you have 12 yards of yard needed to be fenced. And each post will be placed two yards away from each other you will need 6 fence posts. Between the six fence post evenly spaced out every two yards away from each other you will cover the 12 yards needed to be covered.

handshake

If there are 14 people including yourself in a room. If you need to shake everyone's hand then you need to shake 13 peoples hands. You wouldn't shake your own hand so the 13 others are the people whose hands you would shake.

application

This problem could be applied in a carpenters life because they may need to do it for their job. They may need to evenly cut a certain amount of wood. This could be useful for a number of people and their jobs.