请教一道数学题，求解答

sysxy1987

DS: If 2/5 of the students at college c are business majors, what is the number of female students at college c?

(1) 2/5 of the male students at college c are business majors

(2) 200 of the female students at college c are business majors

我觉得没有告诉总人数是无法算出的啊，请各位知道的解答下啊！

csher

C?

总人数的2/5和所有男生2/5是business majors=〉所有女生的2/5也是business

200个女生是business

所以一共有女生500个

sysxy1987

醍醐灌顶啊，我晕，没想到这点。多谢解答了！