math problem solving

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mr. mancho, my great dane, ate 125 hot dogs over a five-day period. each day he ate seven more hot dogs than on the previous day. how many hot dogs did he eat on the first day

  • math problem solving -

    Let X be the number eaten the first day.

    X + (X+7) + (X+14) + (X+21) + (X+28) = 125
    5X + 70 = 125
    5X = 55
    X = 11

    Check: 11 + 18 + 25 + 32 + 39 = 125

    This couls have been obtained more easily (and without algebra) by recognizing that the number consumed on the third day (25) was the average for the five-day period.

  • math problem solving -

    eleven

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