Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Which is heavier: a ton of bricks or a ton of feathers?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

You need to arrange three 7 and mathematical symbols to form number 1?

The host of a game show offers the guest a choice of three doors. Behind one is an 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?

What is always in front of you but can’t be seen?

A sundial has the fewest moving parts of any timepiece. Which has the most?

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?