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).
IS 25%, YOU FIND OUT BY DIVIDING 8760/100=87.60 WHICH REPRESENTS 1 PERCENT AND THEN 2160/87.60=25% ALSO, IF YOU DIVIDE 8760/2190=4, SO THIS REPRESENTS 25% HOPE IS CLEAR