What number should come in place of the question mark below?

How many times can you subtract the number 5 from 25?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can you name four days which start with the letter 'T'?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

If all the below statements are true

1. Gianni was either in Italy or France in 1997.
2. If Gianni did not kill Versace, Hilton must have killed him.
3. If Versace died of suffocation, then either Gianni killed him or Versace committed suicide.
4. If Gianni was in Italy in 1997, then Gianni did not kill Versace.
5. Versace died of suffocation, but he did not kill himself.

Who killed Versace and where was Gianni in 1997?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?