Yup, I got my inspiration from a daily math-lottery post, but as I can solve the ones they post daily in 5 seconds, I decided to up the difficulty a bit for this one :)
Here is the link to their newest daily math-lottery post: https://steemit.com/steemit/@steemitlotteries/daily-math-challenge-48-prize-free-lottery-tickets
Those are insanely easy, so I made this one much more difficult :)
I'm doing these kinds of puzzles daily though, so you can try the one of today at https://steemit.com/contest/@pizzachain/intelligence-contest-8-win-100-of-the-sbd-free-votes or wait for tomorrow's puzzle :)