Mrs. Henry opened a bag of sugar. She poured 1,500 grams of sugar into 5 beakers and 500 grams of sugar into 4 beakers. She had 500 grams left over. What was the mass of the bag of sugar in kilograms before Mrs. Henry opened it?

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters