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.

How many words can a pen with half refill write?

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

I have branches, but no fruit, trunk or leaves. What am I?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

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?

What brings you down but never up?

What can you deduce from the following BrainBat?

CRY
LMKI