Replace the question mark with the number below given a simple math problem.

If we change the South-East direction into North and North-East into West and all others similarly.
Can you find out which direction will be in the place of South-West direction?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

Why is the Hole below a Lock?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

What makes this number unique: 8,549,176,320?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Which of the eight images will fill the missing image in the puzzle below?

You throw me out when you want to use me and you take me in when you don't want to use me.

Who Am I?

What always comes into a house through the keyhole?