book Maths Puzzle Numerical Ability

If the sides of a square are decreased by 2 cm, the area is decreased by 36 cm^2. What were the dimensions of the original square?

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book Other Question

List the first four terms of each arithmetic sequence
tn= -3+ (n-1)(5)
(5x^-4y^-6z^5)(-4x^5y^5z^-3)(-4x^2yz^-1)