exam Maths Puzzle Numerical Ability

Hi, I'm having trouble with inverse functions. Can you help me?

Find the inverse function of f.

f(x) = x-2/x+2

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exam Other Question

From a piece of cloth we cut 1/5, then 3/8 of the rest and we see that 22m remains more than the 2/5 of the quantitie initial.How many meters of cloth were there at the begining ? x+4x < 3(1+x)