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

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

I have 50 feet long of cloth, I need to create 50 handkerchiefs each size of 1 foot. I take one minute to cut a 1-foot handkerchief. So how long will it take to cut 50 handkerchiefs?

Can you write down eight eights so that they add up to one thousand?

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

? : 3839 :: 11 : 1209

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

Identify The phrase in the picture.

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Take one out and scratch my head, I am now black but once was red. What am I?