exam Maths Puzzle Numerical Ability

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?

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exam Other Question

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

Can someone show me how to work this problem. I need to see how to simplify
given: f(x)-1/x and g(x)=2/x^2 find f+g(-3)

Thanks!