Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

What does this rebus means ?

PROG WORKRESS

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

How can a man go eight days without sleep?

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

In the four images below, can you find the odd one out?