Question

Had three different kinds of stickers put a bird sticker on every 30 page is what sticker on every 50 page iRobot sticker on every 60 page will any of the first 600 pages have all three stickers if so which pages

Answer 1

The least common multiple of 30, 50, 60 is 300. Page 300 and page 600 will have all 3 stickers (assuming first stickers are placed on pages 30, 50, 60).