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.

Can you find the 09 errors in the picture below?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

In a town, there are four houses located at different distances from each other. Following are the distances:

The third house is 60 meters apart from the first house.
The fourth house is 40 meters apart from the second house.
The third house is 10 meters nearer to the fourth house than it is to the second house.

Can you find out the distance between the fourth and the first house?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What goes through cities and fields, but never moves?

Find The Next Number in the series:

12 13 15 17 111 113 117 119 123 ?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

What number do you get when you multiply all of the numbers on a telephone's number pad?