设男生为4X人,女生6X人,4X+12:6X-10=2:1 4X+12=12X-20 8X=32 X=4男生:4*4=16女生:6*4=24
6X=4YX+12=2(Y-10)X=16Y=24
X/Y=2/3(X+12):(Y-10)=2
22 24