book Maths Puzzle Numerical Ability

Premuim coffee sells for $6.00 per pound, and regular coffee sells for $4.00 per pound.How many pounds of each type of coffee should be blended to obtain 100 pounds of a blend that

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Hi Tutors, it's me again I need help with the following problems can you help me. Thank you so much.

y=3x+2

x=5x

y=2x+1 2*square root of 27 + square root of 48
can this problem be solved? I thought the radicals had to be the same. If it can be solved can you show me how??