exam Maths Puzzle Numerical Ability

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

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ONE NUMBER IS 12 MORE THAN ANOTHER. THE SUM OF THE SMALLER NUMBER AND TWICE THE LARGER NUMBER IS 39. FIND THE LARGER NYMBER. Solve the equation w=Cr-2 for r where C is a constant and r is the distance that the object is from the center of the earth.