Question 1020172
The total quantity of boys and girls is 5+3=8 equal parts.


{{{5*parts*(0.2)=1}}}, how many parts for BOYS in first class;


{{{3*parts*(0.6)=1.8}}}, how many parts for GIRLS in first class;


The class in first class,  {{{((1+1.8)/8)100*percent}}}.


35%