exam Maths Puzzle Numerical Ability

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)]

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Find the selling price per pound of a tea mixture made from 40lb of tea costing $5.40 per pound and 60lb of tea costing $3.25 per pound. What is the lateral area of a rectangular solid with lenght 10, width 6, and height 5.