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DIY Challenge 2: Finding the fake container, fewer weighings

There are 5 containers of with 5 coins each. All containers have coins of weight 5gm, expect one fake container, which has all coins of only 2gm.

Jerry is trying to find a strategy to find the fake container. She took 1 coin from the 1st container, 2 coins from the 2nd one, 3 from the 3rd….and so on.

She then placed all these coins on a digital weighing scale.

Suppose the weight came out to be 63 grams. Can you tell which one is the fake container?

What students worked out3

  • Student 4

    the 4rth bag is the fake coin one

  • Student 1

    Coin bag 4 is the fake bag

  • Student 2

    BAG NUMBER 4