book Maths Puzzle Numerical Ability

I am trying to re-write the following formula into a quadratic equtation and I seemed lost.

((48/n)+3)(n-2)= ((48/n)+3)(n-2)-48

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book Other Question

explain how to find the probability of independent events.use examples. The second angle is 20 degrees less than the first angle and the third angle is one half of the first degree what are the mesurement of each angle on the insolate triangle.