exam Maths Puzzle Numerical Ability

please help me solve this equation
Find the LCM
5(z-3)and 15(z-3)

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exam Other Question

a fish tank which is right triangle prism, is 40 cm by 25 cm. If it is filled with water, what is the mass of the water? Solve by completing the square:
x^2 + 6x +1 = 0