Thirty don't own any stocks. Twenty don't own any bonds. a diagram, where every dash is 10 persons looks like this:
_ _ _ _ _ _ _ . . . Bond owners
. . . _ _ _ _ _ _ _ _ . . .Stock owners
Fifty overlap, so I would say 50 own both stocks and bonds.
Post this under math (Education), not under "Investing."
a survey of 100 investors in stocks and bonds revealed that 80 investors owned stocks and 70 owned bonds. how many investors owned both stocks and bonds?
