Name a key which is hardest to turn.

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

Can you count the number of quadrilaterals in the picture below?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Find out which of the given views in the picture is accurately the top view of the given pyramid.