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    OlympiadHardLogic5–6

    A basket holds apples. Ana takes half of them plus one more. Then Bruno takes half of what is left plus one more. Four apples remain. How many apples were in the basket at the start?

    Um cesto tem maçãs. A Ana leva metade delas e mais uma. Depois o Bruno leva metade das que restam e mais uma. Sobram quatro maçãs. Quantas maçãs havia no cesto no início?

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    Solution

    Step 1 of 3

    1. 1.Work backwards from the end. Before Bruno's “plus one” there were 4+1=54 + 1 = 5, which was half, so before Bruno there were 1010.