Mr Smith has lots of pound coins, ten boxes in all. Each box contains 100 pound coins, but one box contains coins which are all counterfeit and are slightly lighter, 1/16 of an ounce lighter to be exact.

The problem lies in the fact that they all look identical, the only way to tell them apart is to weigh them.

Mr Smith knows the correct weight for a box, but how many weighings are required to determine which box contains the counterfeit ones?

[Ref: ZJYH]

Hint: The answer is a lot less than 100 weighings.

Answer: One weighing is enough.

Take one coin from the first box, two from the second and so on.

When the coins are weighed, the number of 1/16ths light will tell us which box contains the counterfeits.

For example if it was box 5, the weighing would be 5/16 too light.

Puzzle 355

Using the BrainTracker grid below, how many words can you find? Each word must contain the central P and no letter can be used twice. The letters do not have to be connected. Proper nouns are not allowed, however, plurals are. Can you find the nine letter word?