Which five letter word can be added at the end of below word to form a
valid word?

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What is the coolest letter in the alphabet?

What has many teeth, but cannot bite?

The more of this there is, the less you see. What is it?

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

What has 88 keys?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

A man escapes from jail using help from his girlfriend. The investigators suspect four girls of being the man's girlfriend.

Out of those four girls, one is his girlfriend who is lying. Two of the girls are completely innocent and are speaking the truth. One of the girls is the man's sister who is helping the girlfriend lie. Following are the statements from all four of them:

Ariana: "Myrna is his girlfriend."
Jane: "Angelina is lying."
Angelina: "Ariana is lying."
Myrna: "Jane is not his sister."

Can you find out who is the man's sister among them?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Prove that the below maths equation is true.

8 + 8 = 91