Answer
Sue should exercise between 5 and 105 minutes to stay within the guidelines.
Work Step by Step
Given are a minimum and maximum value that determine the limits of exercising per week. To determine how long should Sue exercise to stay within the guidelines, we just need to know how far is her progress to those limits. So, we'll add up her progress:
$40+45+0+50+25+35=195$
We can see that Sue is very close to meet the minimum guideline. So, we can represent the amount of time she should exercise on the last day in the following inequality:
$5\leq x\leq105$, where x is the amount of time she should exercise on the last day.
