Which One is Heavier? - Answer
Other pages: Welcome! Home Contents Get your brain teaser solved! View my blog on particle physics here Which One is Heavier? - Answer Age group: All The question was: "You have 9 marbles: 8 of them weigh 1 gram each; 1 weighs 1.1 gram. 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 twice. You must determine which of the 9 marbles is the heavier one using the balance only twice." You can also view the question here: Which One is Heavier? Now coming to the Answer! The important point to keep in mind here is that the balance can be used only twice . There are a total of 9 marbles, and we must divide them in such a way that we can compare all balls in 2 uses of the balance. The way to go is as follows: Divide the 9 marbles into groups of 3 . Let the groups be A (containing marbles A1, A2, A3), B ( containing marbles B1, B2, B3) and C (containing marble...