1. "Well, if it isn't Stan, of all people," Doug exclaimed. "Fancy meeting here in the same hotel." "Doug!" Stan cried. "It's good to see you. What's your room?" His friend gave the number. "No chance of a teaser on that." "But there is," Stan told him. "Both have three figures, but yours is the reverse of my number and my number is five-sixths of yours." What was Doug's number?

523

594

611