Question 585615
"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 


{{{10x+7y<150}}}

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