exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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 The problem i need help with is 7x+3>9x-5.

This is my work for the problem.

7x+9x>3-5
16x>-2
16x/16>-2/16 = x=<-8 ( the correct answer is x<4 but i do not know where i