A,B两校的男、女生人数的比分别为8:7和30:31,两校合并后男、女生人数的比是27:26,则A,B两校合并前人数比是 .
0.25== %= ÷ = : .
÷12==0.5= %= : .
=3÷ = %
= :8=0.375=12÷ = %
= ÷12== (填小数)