Question

Gary exercises 1.75 hours on Mondays, Wednesdays, and Saturdays. How many weeks will it take Gary to exercise a total of 21 hours?

What equation models the problem?


How many weeks will it take Gary to exercise a total of 21 hours?

Answer 1

4 weeks

Explanation:

Equation :

21 / 1.75 x 3 = Weeks needed

To calculate

1.75 hours = 1 hour and 45 mins

= 105 mins

1 week he runs 105x3 = 315 minutes

To make it easier, convert it all to minutes

21 hours = 1260 minutes

1260 /315 = 4

Answer 2

4

Explanation:

Gary's total exercise time for a week is ...

3×1.75 hours = 5.25 hours

Then to accumulate 21 hours of exercise time, it will take Gary ...

(21 hours)/(5.25 hours/week) = (21/5.25) weeks = 4 weeks