Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Find the Odd One Out?
84129
32418
47632
36119
67626
72927

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

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

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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

Can you solve the below geography rebus by decoding the below rebus ?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?