exam Maths Puzzle Numerical Ability

What is the lateral area of a rectangular solid with lenght 10, width 6, and height 5.

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1.a/(b+c) +b/(c+a) +c/(a+b) >=3/2.[hint:Apply the specified inequality to the sets of numbers b+c,c+a,a+b;1/(b+c),1/?(c+a),1/(a+b)] 32x=sqrt(1-48x)