Question 855784
If the ratio is 7:5 this means for every 7 males there are 5 females, yes?
In simplest terms, this means in a group of 7 males and 5 females, there are 12 in total. (7+5=12)
To put this into a fraction, {{{7/12}}} of the runners are male and {{{5/12}}} of the runners are female.

Now, to take a a fraction of a whole number, multiply the fraction by 144.

Amount of males:
{{{(7/12)*144=84}}}

Amount of females:
{{{(5/12)*144=60}}}
So, there are 60 females in the race.

To check your answer:
Ratio = males/females
84/60 = 7/5=7:5