The diagram means that parallelograms come in two kinds: rectangles and rhombuses.
So, .. all rhombuses are parallelograms .. all rectangles are parallelograms .. no rectangles are rhombuses This diagram only recognizes parallelograms that are rectangles and rhombuses. There are also other kinds of parallelograms, but those are not shown here.
In 1500 people of 200 lb each, the total weight would be 300000 lb. Set up a proportion: 200lb/3.2*10^-5 = 300,000lb/x (3.2*10^-5*300,000)/200 = x x = 0.48, I believe
