Of 350 male athletes at a high school, some play only basketball, some play only baseball, and some do both. If 250 of the males play basketball, and 120 play both sports, how many of the males play baseball?
If 250 of the males play basketball, and 120 play both sports, then only 250-120=<<250-120=130>>130 males play only basketball.
The total number of males who play either basketball or baseball is 130+120=<<130+120=250>>250.
The total number of males athletes at the high school is 350, meaning 350-250=<<350-250=100>>100 males play baseball only. Answer: \boxed{100}.