Are you reversing the math? The easiest way to think about it is to break it down and reverse each basic equation.

X = n * 2.5 reversed is n = X / 2.5 and keep going...

A = 160 * 2.5

B = A - 100

X = B * 0.145

reverse...

D = X / 0.145

E = D + 100

F = E / 2.5

So now F = 160

Now put it all back together

X = ( (43.5 / 0.145) + 100 ) / 2.5

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