How do you go from 98 to 720 using just one letter?

In an interview, a boy was asked an unusual question 'How two persons sitting with a table in between them can't see each other?' He was unable to reply. Can you?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Look at the picture and find out which square is not linked with any of the other squares.

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Move three sticks of the spiral below to form a square.