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problem solving

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a stack of firewood has 28 pieces on the bottom row,24 on the top of those,then 20 ,and so on.If there are 108 pieces of wood.How many rows are there?

  • problem solving -

    well you could solve it the long way

    28
    24
    20
    16
    12
    8
    4
    add um all up=112
    108 is 4 less so subtract the last row,

    6 rows

    there is some equation that is soposed to be faster, but seeing as all that took me 40 seconds aprox. WELL

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