# Prize Puzzle Competition 3

7.It is possible to write down the digits 1 to 9 (writing each once and once only, and in order) and then place ordinary arithmetical signs as necessary so that the answer to the entire sum is 100.
For example -
 1 x 2 + 34 + 56 + 7 - 8 + 9 = 100and there several other ways it can be done.
Find a way that uses only + and - signs for addition and subtraction.
Note there are 12 possible answers but only 1 need be given.

 8 This brief message has been written in cipher.Each letter in the original message has been substituted by some other letter.LYCW ZQHNX FYZZ XYCN RYOBLW XBYXNo letter represents itself.Can you work out what the original message might have been?

 9 Kerry and Nick were going to cut the grass on their square lawn. They agreed that each should cut one-half of the area.Kerry went first and cut a border 2 metres wide all the way around.After doing a few sums, Nicki agreed that exactly one-half had been cut and happily cut the rest.What was the area of the lawn?

The winner of Competition #2 was Matt Chamberlain of Year 10, Reading School