exam Maths Puzzle Numerical Ability

Subtract. simplify by collecting like radical terms if possible

4sqrt27 - 4sqrt3

Thank you so very much~

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exam Other Question

An economy has two industries: lumber and coal.
Production of $1 worth of lumber requires $0.20 from lumber and $0.30 from coal.
Production of $1 worth of coal requires $0.10 fro 6p5 + 4p3 - 8p4 + 10p2. Please show me how to solve? (Exponents and Polynomials)