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?

  4

Step-by-step 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

4 weeks

Step-by-step 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

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

-2 is the right