Cryptology

A very useful essay about ciphering and codewords. Worth a read if mildly interested:

http://www.ridex.co.uk/cryptology/

Are You Smarter than an 11 Year Old?

I found some old 11+ maths questions printed in a paper recently. They are taken from the 1950’s, you should be able to do these in your head. If you can’t, start worrying.
1 – 3755 is multiplied by 25 then divided by 125. What’s the answer?
2 – A motorist leaves home at 10:15am and drives at 32 miles per hour. He stops for lunch from noon to 1:45pm and then continues his journey at 30 miles per hour. How far has he travelled by 5pm?
3 – An aeroplane uses 100 gallons of fuel to fly 150 miles, how far could it fly using 40 gallons?
4 – Write in figures: Twelve thousand and twelve.
5 – A race is started at 23 minutes past three and finishes at 23 minutes to four, how long did it last