exam Maths Puzzle Numerical Ability

On page 224 number 5, I am not sure how to work it. Can you show me the step by step solution to be able to solve the others? Also, do you have any tips on how to solve these probl

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exam Other Question

base of temple is a rectangle with a perimeter of 300m. the area of the base is 4400m. what are the dimensions of the base?

all i have is
l+w=perimeter
lxw=4400 If A is a square matrix with the property (A with an exponet of 2) = 0, show that (I - A)inverse = A + I.

Thank you