exam Maths Puzzle Numerical Ability

25h/(7h-35) + 3h/(35h-175)

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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)] 5x + y = 20