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.

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

When can we add 2 to 11 and get 1 as the correct answer?

Solve the counting riddle by identifying the number of triangles in the given picture.

The centre of the third figure is empty. What digit should fit inside?

In which direction should the missing arrow point?

This is a famous paradox which has caused a great deal of argument and disbelief from many who cannot accept the correct answer. Four balls are placed in a hat. One is white, one is blue and the other two are red. The bag is shaken and someone draws two balls from the hat. He looks at the two balls and announces that at least one of them is red. What are the chances that the other ball he has drawn out is also red?

Why do we preferably have round manhole covers and not square ones?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.