exam Maths Puzzle Numerical Ability

if tan B=(nsinA.cosA)/(1-n(sinA)^2) then prove that tan(A-B)=(1-n)tanA

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Another Geometry word problem that I cannot translate into algebra:

If two angles are supplementary, and the larger angle is 20 degrees less than three times the smaller angle, find the measure of each angle. Hello, I am having trouble answering this question. Can someone please help?

8 * 5 + 36 - 2*(44 - 2 * 3)

Thanks