exam Maths Puzzle Numerical Ability

x/4+2/4= 7/2

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Find the inverse of each the following matrices. A using the cofactor expansion
A=-1 3 -4
...2 4 1
...-4 2 -9

and A=0 0 2 0
......1 0 0 1
......0-1 3 0
..... The Length of a rectangular label is three times its width. If the length is decreased by 1 while the width stayed the same, the area of the new label would be 44 square centimeters. Find the original length and the width of the label.