Good Riddles

 
Can you ? (medium)

Question: If 4+5=24 7+2=21 9+6=63 6+7=?

Riddle #3 (easy)

Question: What can you catch but not throw?

Question: What is brown and sticky?

Riddle #3279 (medium)

Question: I have 6 faces and 21 eyes, but can't see a thing. What am I?

... (medium)

Question: What cannot be seen or felt, but can only be broken by voice?