Since you know that this is clearly a ratio what you need to find is that there are a ratio of females of males which is 1:6.
We can do it like this to create this equation in our problem.
M(males)
F(females)
M+F=total
6F+F=total
7F=total
F=(1/7)total
Which means that there are 7 from every student which leads to us bringing that there is 1 female and 6 male.
1 out of 7 is based as 1/7.
If this helps could you mark this as brainiest? Thanks, have a good day.