妈妈的岁数是小青的7倍,妈妈35岁,小青 岁,明年妈妈的岁数是小青的 倍?
:24=== ÷16= %
= :35=5:7= ÷21=.
== ÷20=6: = %= 折.
÷15=0.8== %= 折.
1﹣1× =0 ÷ == : =75%