A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

Solve the mathematical equation in the picture below.

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What will you call your mother's brother's brother-in-law?