book Maths Puzzle Numerical Ability

a/bc + b/ac - c/ab = ?

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book Other Question

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 directions: graph the equation. label three key points on the graph.

y=2|x-4|-1

thank you