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

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

The Little ant seems to be always confused. Do you know why?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

The host of a game show, offers the guest a choice of three doors. Behind one is a expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

A man dies of old age on his 25 birthday. How is this possible?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

What has a ring but no finger?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.