SOLUTION: At Charmaine's auto shop, it takes 10 minutes to do an oil change and 7 minutes to do a tire change. Charmaine has less than 2.5 hours (150 minutes) left to work before she has to
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Question 585615: At Charmaine's auto shop, it takes 10 minutes to do an oil change and 7 minutes to do a tire change. Charmaine has less than 2.5 hours (150 minutes) left to work before she has to leave for the day. Write an inequality that gives the number of oil changes, x , and the number of tire changes, y , that she can do before she leaves. Answer by jim_thompson5910(35256) (Show Source):
You can put this solution on YOUR website! "it takes 10 minutes to do an oil change" and there are x oil changes, so it takes 10x minutes to do x oil changes. Similarly, it takes 7y minutes to do y tire changes.
In total it takes 10x+7y minutes to do x oil changes and y tire changes. This quantity must be less than 150 minutes. So the answer is
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