六年级同学乘汽车到某地旅游,买车票99张,共花28元.其中单程票每张0.2元,往返票0.4元,单程票和往返票相差 张.
=20: =0.625= ÷40= %
.
10: =0.625== ÷32= .
0.75== %= :12= 折.
==9: = %