BRAIN TEASERS

1 What makes this number unique -- 8,549,176,320?

2 If you were cycling in a race and you passed the person in 3rd place, what place would you be in now?

3 A farmer arranged young trees in rows so as to form a square and it was found that 146 trees were not planted. To enlarge the square by one extra row each way he had to buy 31 additional trees. How many trees were there in the orchard when it was finished?

4 Which item is dearer: one that initially costs €100 and has 20% mark-up, or an item that initially costs €150 but has 20% off?

5 If you’re 6 metres feet away from a door and with each move, you advance half the distance to the door. How many moves will it take to reach the door?