I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

what's the probability of getting a king or a queen from a pack of 52 cards?

I look at you, you look at me, I raise my right, you raise your left. What am I?

When we see 2 but call 10?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

Replace the question mark with the correct number in below Picture: