Answer: Hello mate!
You know that 2/5 of the total girls signed up to play softball.
an equal number of the girls signed up to play pitcher, infield, and outfield.
this means that we could divide the 2/5 initial group into 3 equal smaller groups (one for each position)
then the fraction of girls that signed up to play outfield is:
(1/3)*(2/5) = 2/15
then 2/15 of the total girls signed to play softball in the position of outfield.