book Maths Puzzle Numerical Ability

divide 20x^5-8x4-5x^3 by 4x^3

please explain in detail

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book Other Question

I am having trouble with P=2w + 2L Here is what I did:
50= 2(1 + 1/3L)+2L =
50(3)=2(3) 1(3) 1/3(3) 2L(3)=
150= 6(3+L)+6L=
150= 18 +6L + 6L
150 - 18+ 12L
132= 12L
132/12= Quick question....What is the difference between a precentage and a "true" percentage?