exam Maths Puzzle Numerical Ability

Hi, Could someone please show me solve this type of problem?
Log(120)= -100/12*(1/20 - 1/x) I need to find x
Thank you

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exam Other Question

Express the follolwing in terms of x {x>0}
sin{cos^-1{x/2}} FROM A SQUARE PIECE OF CARDBOARD WITH WIDTH x INCHES, A SQUARE OF WIDTH x-3 INCHES IS REMOVED FROM THE CENTER. WHAT IS THE AREA OF THE REMAINING PIECE AS A FUNCTION OF x.