Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not rounded numerals equals 24.

What has a bottom at the top?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Below rebus represent famous DiCaprio movie. Can you name it?

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

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

What is it?

The more of this there is, the less you see. What is it?