exam Maths Puzzle Numerical Ability

What same number should be added to 2, 7, 10 and 25 so that they are in proportion?

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exam Other Question

if f(x)=9-x^2 and g(x)=2x-2, find (f-g)(-2) solve each of the following systems by substitution:

4x-12y=5
-x+3y=-1