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24 September, 18:23

For her exercise today, Amy 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 4 minutes, and each lap she swims takes her 2 minutes. She wants to exercise for at least 40 minutes today. Using the values and variables given, write an inequality describing this.

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  1. 24 September, 18:50
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    1. Let r be the number of laps she runs. If each lap she runs takes her 4 minutes, then r laps take her 4r minutes.

    2. Let s be the number of laps she swims. If each lap she swims takes her 2 minutes, then s laps take her 2s minutes.

    3. In total she will exercise 4r+2s minutes. You know that Amy wants to exercise for at least 40 minutes today, therefore,

    4r+2s≥40.

    Answer: 4r+2s≥40.
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