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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1.) The mailroom is on the 6th floor. The mailman goes up 2 floors to deliver the mail. Next he goes up 7 floors. Then he goes down 11 floors. What floor is he on?

Thank yall so much How many lbs of Brazilian coffee costing $6.00 per lb must be mixed with how many lbs of columbian coffee costing $4.00 per lb to produce 36 lbs of a mixture costing $4.50 per lb?