exam Maths Puzzle Numerical Ability

Factor completely. 12x^3 – 3xy^2 I got 3x(4x – y)(x + y) Is this correct

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exam Other Question

Solve the system by using the addition method. -0.1x+0.05y=5 and 0.05x+0.06y=2.7 What is x? One half of the sum of a number and 6 is less than 25. What is the number?
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