Two fathers and two sons decided to go to a shop and buy some sweets upon reaching. Each of them bought 1 kg of sweet. All of them returned home after some time and found out that they had 3kg of sweets with them.

They did not eat the sweets in the way, nor threw or lose anything. Then, how can this be possible?

People make me, save me, change me, raise me. What am I?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

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

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

You see a mathematical expression in the picture. Can you think of a movie that this expression refers to?

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?

Before Mount Everest was discovered, what was the highest mountain in the world?