exam Maths Puzzle Numerical Ability

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

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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? for what value of m will the graphs of 3x+my=6 and 2x-8y=4 have infinite solutions?