exam Maths Puzzle Numerical Ability

Hello out there,I need some help with some tough problems,the first one is,State whether the system is consistent and independent,consistent and dependent,or inconsistent.4x+2y=8 a

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A sales rep for a company estimates that her automobile gasoline consumption averages 28 mpg on highway and 22 mpg in the city. A recent trip covered 627 miles and 24 gallons of ga How many liters of 22% and 12% acetic acid should be mixed to produce 48 liters of 15% acetic acid?