exam Maths Puzzle Numerical Ability

the complement of an angle is 18 degrees more than 1/3 its supplement. find the measure of the angle.

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exam Other Question

I need to find the center and radius: {{{ 3x^2+3y^2-6x+12y=0 }}}
I was able to get an answer of (1,-2) but I can't figure out the radius.
I added 4 and 2 to both sides and came o [(x^2-4)/(x^2+3x-10)] / [(x^2+5x+6)/(x^2+8x+5)]