A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

In the picture given below, can you find out which digit will take place of the question mark?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

Count the squares in the matchstick puzzle below?

You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?

What jumps when it walks and sits when it stands?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Can you identify the famous TV character from the rebus below?