Can you start the fire using two pieces of wood?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What does this rebus mean?

O
N
C
E
TIME

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

What English word has three consecutive double letters?

What is the next number?

77, 49, 36, 18 ?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

What is the next number in the series?

15 29 56 108 208 ?

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?