Good Riddles

 
Riddle #162 (medium)

Question: A container that takes no keys,
but a golden delight lies within me.

What am I?

Question: Queens can move horizontally, vertically and diagonally any number of spaces as illustrated. One piece 'attacks' another if it moves to the same tile that the other piece is on. How can you arrange eight queens on the board so they cannot attack each other?

Riddle #372 (medium)

Question: I'm in everybody but everybody still wants me.
I won't feed you but I'll feed the tree.

What am I?

Riddle #405 (medium)

Question: You wear me every day but you never put me on.
I will change colors if you leave me out too long.

What am I?

Riddle #410 (medium)

Question: When is 1500 plus 20 and 1600 minus 40 the same thing?