Don't Quit

http://www.thedontquitpoem.com/index.htm

Dear people, it's August already. How far you've come, how much you've learnt :)
Jia you for end of years !!
You must persevere. Don't quit.

Puzzle 4

More knights and knaves? Yeah!


On an island, the populace is of two kinds: knights and knaves. Knights always tell the truth, knaves always lie.
An islander - call him A - made a statement about himself and a friend, call him B: "Either I am a knave or B is a knight."

What are A and B?


Thanks for your comments! Check out
http://www.cut-the-knot.org/Outline/Logic/KnightKnave2.shtml#solution

Puzzle 3

On an island, the populace is of two kinds: knights and knaves. Knights always tell the truth, knaves always lie.
An islander - call him A - made a statement about himself and a friend, call him B: "At least one of us is a knave."

What are A and B?

They are...
http://www.cut-the-knot.org/Outline/Logic/KnightKnave1.shtml#solution

Puzzle 2

Refer to the diagram on the left.

Find a route that traverses all the edges only once.

Puzzle 1

How do you divide a cake into 8 equal pieces with only 3 cuts ?