exam Maths Puzzle Numerical Ability

x3 -y3

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exam Other Question

The sum of a number and its square is 30. Find the number.

I need not only the answer but the method of how it is solved.

This is what I think the method is X + 30= Xsquared If 70 precent of refrigerators in the United States contain n.l.r.m.i.t.( no longer recognizable moldy icky things), and 7 out of 8 of these contain more than one n.l.r.m.i.t. what percent of refrigerators contain more than one n.l.r.m.i.t.?