book Maths Puzzle Numerical Ability

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.

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book Other Question
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 add and simplify

y over y^2-49 + 7 over y^2+8y+7

please show work