Please do NOT post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.
On Christmas Day my brother and I opened our presents, and then noticed a curious coincidence. If I were to give my bother seven of my presents, then I would have exactly as many presents as my bother. On the other hand, if my brother were to give me seven presents, then I would have exactly twice as many presents as my brother. How many presents did each of us have?
I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.