The ratio of two quantities is just the fraction.
If we want to take the ratio of x to y, we can write it as:
x to y
or,
x : y
or,
x/y
For this question, we want the ratio of Women to Men.
There are 30 Women and 40 Men, thus the ratio would be:
30 to 40
or,
30 : 40
or,
30/40
Reducing, we can write it as:
3 to 4
or,
3 : 4
or,
3/4