exam Maths Puzzle Numerical Ability

x^2-16
_______
x^2-4x

Can someone show me how to work this problem. I need to see how to simplify

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exam Other Question

Tom, Dick, and Harry weigh 50, 85, and 120 lbs. respectively and use a 12ft. plank for a teeterboard. Tom sits 5 ft., Dick sits 4 ft., and Harry sits 3ft., from the fulcrum on the Luis is 10 years older than his brother. Next year, he will be three times as old as his brother. How old is Luis now and What will the brothers age be next year?