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Mathematics 12 Online
OpenStudy (anonymous):

At Elsa's auto shop, it takes 15minutes to do an oil change and 7minutes to do a tire change. Elsa has less than 1.5 hours ( 90minutes) left to work before she has to leave for the day. Write an inequality that gives the number of oil changes, , and the number of tire changes, , that she can do before she leaves.

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