Question

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.

Answer 1

5r+3s≥30

Explanation:

Answer 2

5r + 3s ≥ 30

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.