exam Maths Puzzle Numerical Ability

Find the perimeter of a square if the side measure 3 cm

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I am needing some assistance with this problem: Find each of the following products; a (a + 5)(a - 5)

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A triangle has a perimeter of 165 cm. The first side is 65 cm less than twice the second side. The third side is 10 cm less than the second side. Write and solve an equation to find the length of each side of the triangle.