Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

You can hear me, but you can't touch or see me.

What am I?

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Which digit occurred maximum times between the number 1 and 1000?