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9 TEENAGERS CAN EAT 18 PIZZAS IN 3 DAYS. 1 TEENAGER CAN EAT 1 PIZZA IN 1.5 DAYS. 1 TEENAGER CAN EAT 2 PIZZAS IN 3 DAYS. 9 TEENAGERS CAN EAT 18 PIZZAS IN 3 DAYS IT WILL TAKE 29 DAYS FOR TWO WATER LILIES TO COVER THE WHOLE POND. EACH WATER LILY WILL NEED TO COVER HALF OF THE POND. THE WATER LILIES WILL COVER HALF OF THE POND ON THE 29TH DAY 15 SHIPS. AT THE MOMENT YOU TAKE OFF THERE WILL ALREADY BE 6 NEW YORK-LE HAVRE SHIPS ALREADY AT SEA, ONE DOCKING AT LE HAVRE AND ONE CASTING OFF AT NEW YORK. AT NOON OF EACH DAY OF THE VOYAGE A NEW SHIP WILL BE LAUNCHED. YOU MUST ENCOUNTER EVERY SHIP THAT WAS ALREADY AT SEA (6) AND EACH ONE THAT WAS LAUNCHED DURING YOUR VOYAGE (INCLUDING THE ONE THAT LAUNCHED AT THE SAME TIME YOU DID, SO 7 MORE). SO YOU WILL PASS 13 SHIPS AT SEA AND ALSO ENCOUNTER A SHIP THAT DOCKED AS YOU CAST OFF AND ANOTHER THAT CAST OFF AS YOU DOCKED. THE DIAGRAM BELOW WILL GIVE A CLEARER PICTURE. EACH GREEN DOT INDICATES AN ENCOUNTER WITH A SHIP IT WILL TAKE 198 DAYS. LET'S SAY THE TREE WAS ORIGINALLY ONE FOOT TALL. ON THE FIRST DAY, IT GREW HALF A FOOT; ON THE NEXT DAY 1⁄3 OF 11⁄2 FEET, WHICH IS HALF A FOOT; AND SO ON - IT GREW HALF A FOOT EVERY DAY. SO IN 198 DAYS, IT GREW 99 FEET, AND THEN WAS 100 FEET TALL