exam Maths Puzzle Numerical Ability

I am the worst at story problems can someone help? I have to write a system of 2 equations in 2 unkown and solve each system by substitution.

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A closed rectangular container with a square base is to have a volume of 2000cm3. It costs twice as much per cm2 for the top and bottom as it does for the sides.
Find the dimensio how do i show that rank(A + In) + rank (A - In) = n where A is an involution matrix and is an element of Mn(C). Mn(C) is the set of all square matrices with C the set of complex nu