exam Maths Puzzle Numerical Ability

I dont understand this problem any help is appreciated, Thank you!
x/x-4- 1/x-1 divided by x/x-1+ 2/x-3

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exam Other Question

Hi. Can you please solve this question and please let me know what is the way to arrive at the solution. Find X where X is,
X = [(1/11) + (1/12) + (1/13) + ........ + (1/20)]
Use your calculator to evaluate the following expression if x = 1.07, y = -4.12, and z = -3.76. Round your answer to the nearest tenth.

z2/xY