To solve the problem posed in the statement we need to know the equivalence between squared foot and squared inches, and that is: 1 square foot = 144 square inches So Reed uses 8 pieces of glass per 144 squared inches as well. Now we can use a rule of three, simple and direct proportion to solve the question, it goes like this: 144 squared inches ------> 8 pieces glass 864 squared inches ------> x
x = (864)(8)/144 x = 48 Hence, Reed will use 48 pieces of glass to make a window that is 864 square inches.
