If he climbs three bricks, but slips back two bricks each day, then his net gain is one brick per day. So the apparent answer is 20 days. BUT - on day 17 he won't slip back because he has reached the top, so the answer is 17 DAYS.
The first thought would be wine = £9, bottle = £1, but that won't work because then the wine would only be worth £8 more than the bottle. So, the bottle must be worth less than £1. Therefore, if the bottle is worth 50p the wine must be worth £9 more, which is £9.50, and the total then is £10. Get it? Or you can use algebra, as Amy The Algebra Teacher did!