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 is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Can you solve the photo plexer logic ?

How many bricks does it take to complete a building that is 15 feet wide, 30 feet deep, and 12 feet tall made of brick?

What number divided by 4 is the same as that number minus 4?

Find the next number in the following series:
6, 14, 26, 98, __?

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

what does the below rebus means?

What do you get if you add 2 to 100 four times?