Can you find out which number multiplied by itself will give the output as 12345678987654321?

Rearrange the letters in "new door" to make one word.

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

What has many keys but can’t open a single lock?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

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 find the 09 errors in the picture below?

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?