Anonymous
Anonymous asked in 科學及數學數學 · 1 decade ago

方程式~~~急

Bobby saves a fixed amount of money every day.He find the price of a model is $70 more than his saving in 5 days or $10 more than his saving in 9 days.How much does he save each day?(方程式解答,要步驟)

2 Answers

Rating
  • 1 decade ago
    Favorite Answer

    Let $x be the amount that he saves each day

    5x + 70 = 9x + 10

    70 - 10 = 9x - 5x

    4x = 60

    x = 15.

    2006-10-30 20:06:18 補充:

    He saves $15 each day.

  • 1 decade ago

    Let Bobby saves $X each day

    5x + 70 = 9x + 10

    4X = 60

    x =15

    Bobby saves $15 each day

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