exam Maths Puzzle Numerical Ability

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.

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exam Other Question

jOHN and David are running the 1-mile race. David enters the final quarter first and is running at a rate of 18ft./sec. John enters the final quarter 3 seconds later but is running at a rate of 20 ft.sec. Who will win the race?
5280ft.= 1 mile
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)]