book Maths Puzzle Numerical Ability

2x+4y=6x-10y

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An auto service center has ten fifty-five gallon drums of 90% ethylene glycol, a common antifreeze fluid used in car radiators. The service center also has eight fifty-five gallon i am very confused on this whole thing!! LoL im in the 8th grade at MSMS and im confused!!help me=)