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 a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Can you place three balls such that the equation shown in the picture holds true?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What do you answer even though it never asks you questions?

This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

I have feet, but no legs. Which animal Am I?

Complete the table series riddle by finding the number that can replace "??".

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?