exam Maths Puzzle Numerical Ability

Simpliy: This is so complicated please help.

2/z^2 - 3/2 / 2/5z^2 + 1/3z

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exam Other Question

Please help me solve this.

Solve for y in terms of x:log2x+log2y=1

This is all i have so far: log2xy=1 and log2 rewrites as b^p=n

So, b=2 p=1 and n=xy
What do i do after this? There are 2 copy machines. One can do a printing job in 75 minutes. If both machines print at the same time they can do the printing job in 50 minutes. How long will it take the other machine to do the printing job by itself.