exam Maths Puzzle Numerical Ability

SOMEONE HELP ME PLEASE:
From the information in the table providing values of f(x) and g(x), evaluate (f O g)^-1(3).

x 1 2 3 4 5
f(x) 5 3 5 1 2
g(x) 4 5 1 3 2

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exam Other Question

three times the width of a certain rectangle exceeds twice its length by three inches and four times its length is twelve more than its perimeter.Find the dimensions of a rectangle. This question is about augmented matrices. The question says: Set up and solve the following systems of equations using augmented matrices,

3x-2y=8
6x-4y=1 What are the X and Y values?