exam Maths Puzzle Numerical Ability

Well, there were no questions submitted for this area. I wish these questions were out of a textbook because then I would have an example that I could follow, but they are not. As

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A picture frame measures 12cm by 20cm. 160cm^2 of the picture shows inside the frame. What is the width of the frame? And what is the solution? thanx Please help me solve this equation: g(x)= sq.root of x+21