Replace the question mark with the number below given a simple math problem.

What is common among 11, 69, and 88?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

10+10 and 11+11 can give you the same answer.

Explain how?

What does it mean?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

The cream is heavier than Milk. True or False?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months