exam Maths Puzzle Numerical Ability

Can you please help? I need to solve this problem:

(1/2) + (x/6) = (18/x)

thanks

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exam Other Question

In five years time a father will be three times as old as his son. Five years ago, the father was six times as old as his son. Find their present age. The vertex of parabola is at the point (-1, -3). how do i get the equation of the parabola?