book Maths Puzzle Numerical Ability

A CERTAIN BRASS ALLOY CONTAINS 60% COPPER, 34% ZINC, 6%LEAD. HOW MANY KG OFTHIS BRASS ALLOY AND OF ZINC MUST BE ADDED TO 20KG OF LEAD TO PRODUCE A NEW BRASS ALLOY THAT IS 40% ZINC

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book Other Question

1. x+2x-4+5(2x-4)-2=13 a/bc + b/ac - c/ab = ?