Roundoff Riddle

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.




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To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.