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There are some frogs and some lily pads at a pond. If lily pads with frogs on them have two frogs each, then there is one lily pad with no frogs on it. If each lily pad has exactly one frog on it, then there is a frog with no lily pad. How many frogs are at the pond?

  • math -

    2(n-1) = n+1
    n = 3

    So, 3 pads, 4 frogs

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