book Maths Puzzle Numerical Ability

Find a, when b=10 and B=34 degrees to the nearest tenth.

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book Other Question

A freight train and passenger train start toward each other at the same time from two towns that are 500 miles apart. After 3 hours the trains are still 80 miles apart. if the ra 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