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 black when you buy it, red when you use it, and gray when you throw it away?

What Deficiency does the below rebus represent?

VIT_MIN

I have Rs.50 and I spend it in the way as below.

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Count the number of triangles in the below picture?

What can go through glass without breaking it?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.