I'm not sure what the question is but to get the mean you add up all the numbers and divide them by the amount of numbers there are.
35 + 0.05 * t is the correct equation i believe.
Answer:
3m == 5w, that means for such unit, there is a 2 person difference
30 person difference = 30/2 = 15units
and again one unit means 3m and 5w
so 15*3men, and 15*5women
and you can check the difference is 30