Quantitative Reasoning

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  • PE1.10
  • March 4, 2015 at 2:03 pm #29675

    Ezra Halleck
    Participant

    10. Alan’s grandma uses a pay-as-you go plan for phone service with an access fee of $19 per month and a flat per-minute rate of $.05. A competing plan is $30 per month unlimited voice. How many minutes must the grandma speak per month before the unlimited plan is cheaper? You must solve the problem by defining a variable (not x) and setting up an inequality.

    March 12, 2015 at 9:39 pm #29845

    Meizhu Deng
    Participant

    let m= the minutes grandma can speak per month
    19+ 0.05m < 30
    0.05m < 11
    m <220 (minute)
    The grandma must speak less than 220 minutes before the unlimited plan is cheaper.

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