Depends on the major. Obviously, a math major would take more math courses than most other liberal arts majors (“liberal arts” includes math and science).
Assuming that the major does not require math or science courses, it depends on the school. MIT students (including humanities majors) need to take at least 8 math and science courses, and MIT does not offer “physics for poets” type of courses. Brown students do not have any requirement for math and science courses. Getting away from super-selective schools, some math and science is commonly required, but the math may only be at a relatively low level (perhaps precalculus or non-calculus-based statistics), and science courses could be of the “physics for poets” or “rocks for jocks” type.