exam Maths Puzzle Numerical Ability

Find the selling price per ounce of mixture of 200 oz. of cologne that costs $5.50 per ounce and 500 oz. of a cologne that costs $2.00 per ounce

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exam Other Question

if z1=2+j, z2=3+j and z3=j3

what is the equivalent impedance z if

1/z= 1/z1 + 1/z2 + 1/z3 ?? this was a question given to us for homework and it was not in any text book write the number in standard complex form
20- sqrt of -8