coolkidz

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3 packets of french fries,2 cheese burgers and 1 cup of drinks cost $109.5. 1 packet of french fries, 2 cheese burgers and 3 cups of drinks cost 112.5. what is the cost of a set?
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for sloving equations ,we should do the reverse of the order of operations right? So it's not PEMDAS, its the other way round?
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