book Maths Puzzle Numerical Ability

Any idea how I might start trying to solve this one?

if w = 10, x = 5.5 y = 4 and z = 3

How might I try to solve the equation:

aw + bx +cy + dz = 140.

All suggestions much appreciated

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book Other Question
5/(x+2) - 3X/(x^2-3X)=

5/(x+2)- 3X/(x(x-3))=

It is at this point where I have no earthly idea what to do next. What cancels out? g(x)=-x^2+x-5