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7 May, 21:31

For her exercise today, Keiko plans to both run and swim. Let r be the number of laps she runs and let s be the number of laps she swims. Each lap she runs takes her 5 minutes, and each lap she swims takes her 3 minutes. She wants to exercise for at least 30 minutes today. Using the values and variables given, write an inequality describing this.

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  1. 8 May, 01:29
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    5r + 3s ≥ 30

    Step-by-step explanation:

    We know Keiko wants to do exercise at least 30 minutes a day, and she wants ideally to mix up the activities, by combining running and swimming into her schedule.

    Since each lap she runs takes 5 minutes and each lap she swims takes 3 minutes, these will be the left side of the inequality:

    5r + 3s

    She wants to exercise at least 30 minutes a day, so ...

    5r + 3s ≥ 30

    she could do 3 laps of running and 5 laps of swimming for example.
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