exam Maths Puzzle Numerical Ability

x-12=sq root (16x)

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My question is combination word problem and cost function. I struggle a lot with these. Please assist.
The total cost (in dollars) of producing x compact disks is C(x)=6.80x+ 450 A wholesaler wants to blend coffee containing 35% caffeine with a coffee containing 15% caffeine to produce a 500 pound blend of coffee containing 18% caffeine. How much of each type of coffee is required?