SOLUTION: At Shen's auto shop, it takes him 15 minutes to do an oil change and 20 minutes to do a tire change. Let x be the number of oil changes he does. Let y be the number of tire changes

Algebra ->  Linear-equations -> SOLUTION: At Shen's auto shop, it takes him 15 minutes to do an oil change and 20 minutes to do a tire change. Let x be the number of oil changes he does. Let y be the number of tire changes      Log On


   

Question 1118680: At Shen's auto shop, it takes him 15 minutes to do an oil change and 20 minutes to do a tire change. Let x be the number of oil changes he does. Let y be the number of tire changes he does.
Using the values and variables given, write an inequality describing how many oil changes and tire changes Shen can do in at most 2 hours (120 mins)
Found 2 solutions by t0hierry, ikleyn:
Answer by t0hierry(194) About Me  (Show Source):
You can put this solution on YOUR website!
Assuming tire change and oil change do not take place at the same time, the time spent doing x tire changes and y oil changes is x*15 + y*10 <= 120

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
The solution by the other tutor, obviously, requires a correction.

Please find my correction below: 

    Assuming tire change and oil change do not take place at the same time, the time spent doing x tire changes 

    and y oil changes is x*15 + y*20 <= 120.