Question 1197952
x girls, y boys
{{{3y/4=x/3}}}


-


{{{y(3/4)=x(1/3)}}}

{{{y/x=(1/3)/(3/4)}}}

{{{y/x=4/9}}}


4 parts of the group boys
9 parts of the group girls
total 13 parts


The FRACTION which are boys,
{{{4/13}}}