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.

What does this say?

XLR8

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

How many times do a clock's hands overlap in a day ?

A B C D E F G H

These are the letters given to you. Now you have to find out the letter that comes two to the right of the letter which is immediately to the left of the letter that comes three to the right of the letter that comes midway between the letter two to the left of the letter C and the letter immediately to the right of the letter F.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

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?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?