exam Maths Puzzle Numerical Ability

The length of a rectangle is 4 times the width. The perimeter is 90 cm. Find the width and length.

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exam Other Question

verify that (2x+1)/x-1 is the inverse of x+1/x-2 . I only got to x= y+1/y-2 and got stuck on how to simplify. Which of the following polynomials can be factored as a difference of two squares?

16x2 + 1
9y2 - 1
x2 + 4x + 4
144a2 + 16
all of the above