What is always in front of you but can’t be seen?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

What four weights can be used to balance from 1 to 30 pounds?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Different lights make me strange by changing me into different sizes. What am I?

What does does this rebus picture means ?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

If it took eight men ten hours to build a wall, how long would it take four men to build it?