exam Maths Puzzle Numerical Ability

√3 - √1/3

answer is 2√3
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3

I need to know how to get the answer.

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is c+(a+b)=(a+b)+c an example of the commutative property? is (a*b)c=a(b*c) also an example of commutative property? A landscape designer has to design a retangular pad of concrete at the centre of a rock garden. The length must be less than or equal to twice the width; the perimeter must be less than or equal to 40m; and the area must be greater than or equal to 60m^2