Question 74447
I am assuming that the "sic" girls is actually six.


Let x equal the group size.  60% of the initial group were boys and, after losing six girls and adding 6 boys, the final percentage of boys was 75.


In algebrese :  {{{.6x+6=.75x}}}  or  {{{6=.15x}}}   so


x=40


24 boys  and  16 girls