Which number should replace the question mark?

How many triangles are there in the picture below?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

A man is sitting in a bar when a rich man sits next to him. He turns to the rich man and says, “Did you know I know almost every song that has ever existed?”

The rich man laughs. The man then says, “I bet you all the money you have in your wallet that I can sing a genuine song with a lady’s name of your choice in it. The rich man laughs again and says, “OK, how about my daughter’s name, Jamie Armstrong-Miller?” Minutes later, the man collects his cash and the rich man goes home cashless. What song did the man sing?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A man dies of old age on his 25 birthday. How is this possible?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Why are televisions attracted to people?

How can you tell a raw egg from a hard-boiled egg?