Book Maths Puzzle Algebra

A sporting-goods manufacter has spent $1000.00 researching a new product. it will cost them $4.50 to manufacture the item that they will sell for $12.00. How many items must they sell to bearck even?

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Book Other Question

Christy has a coin collection consisting of nickels and dimes. She has 28 coins worth $2.25. How many of each coin does Christy have? HOW MANY GRAMS OF PURE SALT MUST BE ADDED TO 40 GRAMS OF A 20% SALT SOLUTION TO MAKE A SOLUTION THAT IS 36% SALT?