book Maths Puzzle Numerical Ability

please help
solve:
a over a+1 + 2a + 4 over a^2-3a-4 = 2 over a-4
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book Other Question

Use cramers rule to solve

2x+3y+z=0
5x+y-2z=9
10x-5y+3z=4 a local park is 30 meters long by 20 meters wide. Plans are being made to double the area by adding a strip at one end and another of the same width on one side. find the width of the strips