Math help inequalities

Question

For her exercise today, Kaitlin 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 more than
30
minutes today. Using the values and variables given, write an inequality describing this.

 

Answer 1

The inequality focuses on time spent exercising.  It comes down to how much time she spends running and how much time she spends swimming should be greater than 30.  That is what the question is.  How can you figure that out?  Well, you know know it takes 5 minutes to run a lap, so 5r is the total time it takes for r laps.  You figure the time for swimming in the same way, with s for swimming and multiply it by the number of minutes it takes for her to swim a lap.  The total of minutes running ( 5r) plus the number of minutes swimming (you figured that out) is greater than 30. You should end with the sum of two quantities > 30

Enough for you to solve it?  Let me know.  Keep working!