Number theoryDifficulty 2.0JuniorFind the answerUnited Kingdom
Peter has a lock with a three-digit code. He knows that all the digits of his code are different and that if he divides the second digit by the third and then squares his answer, he will get the first digit. What is the difference between the largest and smallest possible codes?
(A) 42 (B) 468 (C) 499 (D) 510 (E) 541
Want a route through all this instead of an archive? The track
puts 2,604 problems in a working order, from Junior Challenge level to the IMO shortlist.