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Forum > Ðố vui tiếng Anh >> nine marbles

 Post by: uglygirl  member  ID 13636  Date: 09/13/2006 nine marbles         You have 9 marbles: 8 of them weigh 1 ounce each; 1 weighs 1.1 ounce. The 9 marbles are all uniform in size, appearance and shape. You have access to a balance scale containing 2 trays - you may use the balance 2 times. You must determine which of the 9 marbles is the heavier one using the balance only 2 times hi hi hi giải giùm em nhen góp ý kiến Reply: ngocchau  member  REF: 88500  Date: 10/27/2006 HI ugly girl! this is my anwer. First divide them into three groups,each group has three marbles.First,take 2 groups and weigh them.If they has the same weight,they don't have the 1.1 ounce marble.If one is heavier,it has.When you find the group which has this marble.Weigh for the second time.Take two marbles and weigh them.If they have the same weigh,the third one is the 1.1 ounce marble.If one is heavier,it is the marble we need to find. P\S: Is it right? Kí hiệu: : trang cá nhân :chủ để đã đăng  : gởi thư  : thay đổi bài  :ý kiến