exam Maths Puzzle Numerical Ability

A college booke store marks up the price that it pays the publisher for a book by 35%. if the selling price of a book is $56.00, how much did the book store pay for this book?

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A tea mixture was made from 40lbs of tea costing $5.00 per pound and 10lbs of tea costing $3.50 per pound. Find the cost of the tea mixture per pound. in selecting a piece of angle iron for a certain applicatioin, you know that you must have no more cross-sectional area than 60 squared cm , else the angle iron will weigh too much